Date 
Room 
Speaker 
Title 
Dec 06 2017
14:30 
Room 005

Orestis Loukas
(University of Bern)

Accessing the CFT spectrum at large global charge 
ABSTRACT: Studying strongly coupled CFTs with some global symmetry in sectors where the associated global charge is large, often leads to an effective action which is weakly coupled. In this regime, the computation of anomalous dimensions and fusion coefficients becomes perturbatively meaningful. I review our recent progress in understanding the largecharge sectors of classes of scalar CFTs in three dimensions, both at the level of the linear as well as nonlinear sigma model. Additionally, I comment on the verification of the analytic prediction via lattice simulations. 
Dec 01 2017
14:30 
SISSA  Room 137

Jesus Montero
(Oviedo Univ.)

The AdS5 nonAbelian Tdual of KlebanovWitten as a N=1 linear quiver 
ABSTRACT: We study an AdS5 solution constructed using nonAbelian Tduality, acting on the KlebanovWitten background. We show this can be described in terms of a D4NS5NS5’ brane setup dual to a linear quiver with two tails of gauge groups of increasing rank, generalizing the constructions discussed by Bah and Bobev. The central charges computed both holographically and using amaximization are shown to agree. Our result exhibits n^3 scaling with the number of fivebranes, suggesting an elevendimensional interpretation in terms of M5branes. Based on 1705.09661 
Nov 29 2017
14:30 
Room 005

Christopher Couzens
(King's College London)

AdS3/CFT2 and Ftheory 
ABSTRACT: In this talk we consider holographic duals of Ftheory solutions to 2d SCFT's. We approach the problem by classifying a particular class of solutions of type IIB supergravity with AdS_3 factors and varying axiodilaton. The class of solutions we discuss consist of D3 and 7brane configurations and naturally fall into the realm of Ftheory. We prove that for (0,4) supersymmetry in 2d the solutions are essentially unique and we match the holographic central charges to field theory results. We comment on future directions, including AdS_3 solutions of Ftheory, preserving different amounts of supersymmetry. 
Nov 24 2017
14:30 
Room 005

PostDoc Day
()

PostDoc Day 
ABSTRACT: 
Nov 22 2017
14:30 
SISSA

Anton Nedelin
(Bicocca)

T[U(N)] duality web: mirror symmetry and gauge/CFT correspondence 
ABSTRACT: In this talk I will review recently obtained correspondence
between
partition functions of 2d GLSM and certain correlators of Toda CFT. To
illustrate this
correspondence I will consider particular example: the partition function
of 3d
T[U(N)] theory. I will start by reviewing mirror selfduality of this class
of theory and will
briefly derive correspondence between its holomorphic blocks and
DotsenkoFateev
representation of the correlators in qdeformed Toda CFT. Finally I will
show how
upon the circle reduction 3d mirror symmetry reduces to correspondence
between
the partition function of certain 2d N =(2,2) quiver theory and Toda CFT
correlators. 
Nov 08 2017
16:00 
SISSA  Room 5

Pietro Antonio Grassi
(UPO  Alessandria)

Introduction to Integral Forms and Application to Physics  Integration on Supermanifolds 
ABSTRACT: The geometric integration theory for differential forms is extended to supermanifolds.The complex of differential form is enriched to include the integral forms. Applications to Supersymmetric Quantum Field Theories and String Theory is considered.The technique permits an interpolation between all superspace formulations of several theories. 
Oct 18 2017
14:30 
Room 137

Bruno Le Floch
(PCTS  Princeton)

Orbifolds of 4d N=2 supersymmetric gauge theories 
ABSTRACT: After recalling how some 4d N=2 gauge theories arise from
reductions of 6d N=(2,0) superconformal theories on a Riemann surface, I
will discuss two discrete quotients with codimension 2 orbifold
singularities. In the first case the orbifold acts by rotations around
one plane of the 4d N=2 theory; this is related to a GukovWitten
surface operator that imposes a monodromy around that plane. We deduce
instanton partition functions in the presence of surface operators;
interestingly, instantons can fractionalize. In the second case the
orbifold acts by reflection on the 4d theory and the Riemann surface.
We learn how boundaries are encoded in the AGT correspondence. We are
led to consider 4d N=2 quiver theories where some vector multiplets
live on a hemisphere and others on a projective space. 
Oct 04 2017
14:30 
Room 005

Mahmoud Safari
(INFN Bologna)

Multicritical Box^k scalar theories 
ABSTRACT: We employ perturbative RG in the functional form along with epsilonexpansion to study multicritical singlescalar field theories with higher derivative kinetic terms.
We focus on those with a Z_2 symmetric critical point, and depending on the upper critical dimension and the number of derivatives in the kinetic term we distinguish two types of theories which show qualitatively different features.
We discuss each class in turn and extract some scaling dimensions and OPE coefficients at LO or NLO in epsilon. As crosscheck we obtain most of these results making use of the SchwingerDyson equations
and assuming conformal symmetry. Whenever available we also compare our results with those obtained using other approaches. 
Jun 14 2017
16:00 
Room 137

Massimo Taronna
(Brussel University)

Spinning Witten Diagrams 
ABSTRACT: We develop a systematic framework to compute the conformal partial wave expansions (CPWEs) of treelevel fourpoint Witten diagrams with totally symmetric external fields of arbitrary mass and integer spin in AdS_{d+1}. Employing this framework, we determine the CPWE of a generic exchange Witten diagram with spinning exchanged field. As an intermediate step, we diagonalise the linear map between spinning threepoint conformal structures and spinning cubic couplings in AdS. Using this map we can explore the emergence of bulk locality. 
May 24 2017
16:00 
Room 137

Francesco Benini
(SISSA)

Dualities and Anomalies in (2+1)D Quantum Field Theories 
ABSTRACT: In this talk I will present new conjectured dualities that relate gauge theories with scalars or fermions in 2+1 dimensions. The dualities give interesting predictions about the infrared dynamics of those theories. I will also discuss some 't Hooft anomalies in (2+1)D, and anomaly matching for those theories. 
Apr 27 2017
16:00 
Room 005

Ramona Grober
(Durham University, IPPP)

Higgs pair production and the trilinear Higgs selfcoupling 
ABSTRACT: TBA 
Apr 05 2017
16:00 
Room 005

Rodolfo Russo
(QMW  London)

Do black hole microstates carry multipole charges? 
ABSTRACT: Some supersymmetric black holes can be understood in string theory as bound states of Dbranes, which provide, in principle, an explicit description of the black hole microstates. I will discuss how it is possible to derive the geometrical backreaction of the individual microstates by using this underlying string description and the supersymmetric quiver quantum mechanics that emerges at low energies. 
Mar 29 2017
16:00 
Room 137

Florian Goertz
(CERN)

The Axiflavon 
ABSTRACT: 
Dec 07 2016
16:00 
SISSA  Room 5

Latham Boyle
(Perimeter Institute)

What is the standard model of particle physics trying to tell us 
ABSTRACT: I will argue that the standard model contains a rather strong hint that  instead of being simply an ordinary continuous 4D manifold  spacetime is actually the product of a 4D manifold and a certain discrete/finite 6D space (i.e. there are 6D discrete/finite "extra dimensions"). I will introduce this idea and the evidence for it in simple way, and then discuss various outstanding puzzles and future directions 
Nov 30 2016
14:30 
SISSA  Room 5

Postdoc Day
(SISSA)


ABSTRACT: 
Oct 05 2016
16:00 
Room 005

Gabriele Ferretti
(Chalmers  Goteborg)

Gauge theories of partial compositeness 
ABSTRACT: 
Jul 06 2016
16:00 
Room 005

Michael Jay Pérez
(Universidad de Valencia)

Effective Theories of Flavour and the NonUniversal MSSM 
ABSTRACT: Flavour symmetries a la FroggattNielsen mechanism provide arncompelling way to explain the hierarchy of fermionic masses and mixing angles in the Yukawa sector. In Supersymmetric extensions of the Standard Model where the breaking of Supersymmetry occurs at scales much larger than the breaking of flavour, this flavour symmetry must be respected not only by the Yukawas of the superpotential, but by the softbreaking masses and trilinear terms as well. In this work we show that contrary to naive expectations, even starting with flavour blind soft breaking at a high scale, the effective theory obtained after integrating out the heavy mediator fields can be strongly nonuniversal.rnWe explore the phenomenology of these SUSY models after the latest LHCrnsearches for new physics. 
Jun 29 2016
9:00 
Room 137

Second Year Students
(SISSA)

Progress report 
ABSTRACT: 
Jun 21 2016
16:00 
Room 005

Francesco Riva
(CERN)

TBA 
ABSTRACT: 
Jun 08 2016
16:00 
Room 005

Stefano Massai
(MPI  Munich)

Heterotic Tfects, Ftheory and 6D SCFTs 
ABSTRACT: I will discuss several aspects of nongeometric, quantum heterotic compactifications to six dimensions. These are described by a fibration of the Tduality group whose degenerations define stringy, nongeometric defects (Tfects). By using heterotic/Ftheory duality I will show how to classify the 6D (1,0) SCFTs which describe the low energy physics, uncovering a form of duality between nongeometric defects and geometric ADE singularities. This analysis uncovers features of the heterotic string away from the stable degeneration limit that have striking consequences for the geometry of the compactification space. 
May 26 2016
16:00 
Room 004

Francesco D'Eramo
(UCSC  USA)

You can hide but you have to run: direct detection with vector mediators 
ABSTRACT: 
May 18 2016
16:30 
ICTP  Euler Room (note unusual place!)

Malcolm Perry
(DAMTP)

TBA 
ABSTRACT: 
May 11 2016
16:00 
Room 005

Dimitri Polyakov
(Sogang Univ.  South Korea)

Irregular Conformal Blocks and String Field Theory Solutions for Higher Spins 
ABSTRACT: 
May 09 2016
16:00 
Big Meeting Room, 7th floor

Duccio Pappadopulo
(NYU)

Dark matters from hidden sectors 
ABSTRACT: 
May 04 2016
16:00 
Room 005

Francesco Benini
(SISSA)

Black hole microstates in AdS from gauge theory 
ABSTRACT: One of the great successes of string theory, as a theory of quantum gravity,
is the explanation of the entropy of asymptoticallyflat black holes. I will
present, instead, a counting of the microstates of certain black holes
in AdS4. The black holes have an holographic description as RG flows
from a 3D CFT to superconformal quantum mechanics, and the
counting of microstates proceeds via supersymmetric localization.
Along the way, we will define and compute an index for topologically
twisted theories, and propose an extremization principle to
determine the superconformal Rsymmetry in quantum mechanics. 
Apr 06 2016
16:00 
7th floor Big Meeting Room

Aleksandr Azatov
(ICTP)

Searching for new physics in the Higgs production in gluon fusion 
ABSTRACT: 
Mar 07 2016
16:30 
Room 137

Apratim Kaviraj
(Bangalore, Indian institute of Science)

Conformal bootstrap from conformal block expansion 
ABSTRACT: 
Jan 13 2016
14:30 
Room 005

Kazunobu Maruyoshi
(Imperial College  UK)

Anomalies of class $S_k$ theories from 6d 
ABSTRACT: TBA 
Nov 04 2015
16:00 
Room 005

Alberto Mariotti
(VUB  Bruxelles)

Goldstini and the Zpeaked ATLAS excess 
ABSTRACT: I will first review the 3sigma Zpeaked excess recently reported by the ATLAS collaboration and its possible interpretation in supersymmetric models. I will then discuss basic aspects of scenarios with multiple supersymmetry breaking sectors in gauge mediation. In particular I will explain how the low energy spectrum presents in this case extra light fermionic degrees of freedom, the pseudogoldstini. I will derive their radiatively induced mass and describe their interactions with the MSSM particles. I will then show how a simplified model in the MSSM with pseudogoldstini can accommodate the Zpeaked ATLAS excess without conflicting with other existing LHC searches. 
Oct 16 2015
14:00 
Room 137

Rodolfo Russo
(QMW  London)

High energy gravitational scattering in string and field theory 
ABSTRACT: The scattering of high energy gravitons from a heavy object provides an interesting window on quantum gravity. In particular, the Regge limit is tractable both in string theory and at the level of field theory effective action. I'll compare the general results in these two frameworks and summarize how the causality constraints discussed in 1407.5597 arise. 
Jul 15 2015
16:00 
Room 005

Lorenzo Di Pietro
(Weizmann Institute)

QED in d=3 from the epsilonexpansion 
ABSTRACT: 
Jun 10 2015
16:00 
Room 005

Marcello Ciafaloni
(Università di Firenze and INFN, sez. di Firenze)

Unified limiting form of graviton radiation at extreme energies 
ABSTRACT: After a plain introduction to the thoughtexperiment of transplanckian scattering, I present a new calculation of the associated graviton radiation, whose limiting form unifies the soft and highenergy emission regimes. The graviton spin and its helicity transformation phases play a key role in determining both the elegant form of the gravitational coherent state and its new features  like deeply subplanckian characteristic energies and the reduction of fragmentation region and rapidity plateau around the Einstein deflection cone. 
Jun 03 2015
16:00 
Room 137

Luigi Delle Rose
(Università del Salento ed INFN, sez. di Lecce)

Vacuum stability in SM extensions with TeV scale right handed neutrinos 
ABSTRACT: We investigate the stability of the scalar potential in extensions of the Standard Model with right handed neutrinos at the TeV scale. In particular, we focus our analysis on two minimal extensions: the SM+inverse seesaw mechanism and the minimal U(1)' extension with typeI seesaw. These classes of models are potentially accessible at collider and flavour physics experiments. We show that the requirements of stability of the potential within the perturbative evolution under the renormalization group impose significant constraints on the Yukawa couplings of the right handed neutrinos. 
May 28 2015
15:00 
Room 005

Morimitsu Tanimoto
(KITP & Niigata University)

Neutrinos and Discrete Symmetries of Flavors 
ABSTRACT: The neutrino oscillation experiments have revealed the neutrino mass differences and the two large neutrino mixing angles. These experimental data give us a big hint of the flavor symmetry. In this talk, we discuss the recent progress of the flavor models with the nonAbelian discrete symmetry and present phenomenological analyses of neutrino mixing and CP violation. 
May 20 2015
16:00 
Room 005

Tirtha Sankar Ray
(IITKharagpur (India))

The case for an unnatural composite Higgs model 
ABSTRACT: I will try to argue the case for an unnatural composite Higgs model motivated by gauge coupling unification, dark matter and testability at colliders. In the process I will also briefly review the present experimental constraints on the composite Higgs framework. 
May 06 2015
16:00 
SISSA  Room 005

Marco Drewes
(Technische Universität München)

Heavy neutrinos in cosmology and experiment 
ABSTRACT: Neutrinos are the only particles in the Standard Model of particle physics that have only been observed with left handed chirality to date. If right handed neutrinos exist, they could be responsible for several phenomena that have no explanation within the Standard Model, including neutrino oscillations, the baryon asymmetry of the universe, dark matter and dark radiation. In this talk I focus on the mass range between the pion mass and W mass and discuss implications for cosmology and particle physics. 
Apr 14 2015
14:00 
Room 137

Luca Di Luzio
(Università di Genova & INFN, sez. di Genova)

Accidental matter at the LHC 
ABSTRACT: In this talk I will discuss a class of weakscale extensions of the Standard Model which automatically preserve its accidental and approximate symmetry structure at the renormalizable level and which are hence invisible to lowenergy indirect probes. By requiring the consistency of the effective field theory up to scales of $10^{15}$ GeV and after applying cosmological constraints, we arrive at a finite set of possibilities. One of the most striking signatures of this framework is the presence of new charged and/or colored states which can be efficiently produced in highenergy particle colliders and which are stable on the scale of detectors. 
Apr 08 2015
16:00 
Room 005

Roberto Franceschini
(CERN)

Top mass from the bottom (at NLO) 
ABSTRACT: In this talk I will briefly review the present status and motivations for an accurate measurement of the top quark mass. In particular I will outline future strategies and possible outcomes for a global combination of top quark masses measurement at hadron colliders. I will discuss the role that new types of measurement can play to clarify the issues of present precision top quark measurements.
In this context, I will present a distinctly new strategy for the top quark mass measurement based on properties of energy spectra, which can be applied both to bjets and (under several guises) to Bhadrons observables, resulting in a subpercent top quark mass determination. 
Mar 18 2015
16:00 
Room 005

Francesco Sannino
(CP3  Origins)

Rethinking Naturalness: The Interacting Ultraviolet Safe Behaviour of GaugeYukawa Theories 
ABSTRACT: I will critically introduce, classify and discuss the fundamental open issues related to either composite or elementary extensions of the standard model. As for the progress I will exhibit, among other things, the first proof of existence of nonsupersymmetric and nonasymptotically free 4D GaugeYukawa theories (structurally similar to the standard model) which are UV finite thanks to the existence of an exact interacting quantum UV fixed point in the gauge, Yukawa and scalar selfcouplings. The quantum moduli space of the theory will also be precisely determined. Theories with this behaviour have been searched for on the lattice for the past several decades. Our results show the critical ingredients that are needed to construct new classes of fundamental, according to Wilson, theories featuring elementary scalars. I will then comment on the wide phenomenological impact of this discovery. 
Mar 04 2015
16:00 
Room 005

Marco Taoso
(CEA  Saclay (Paris))

Minimal Dark Matter at colliders 
ABSTRACT: I will discuss electroweak multiplets as WIMP dark matter candidates.
In particular I will mainly focus on an EW fermion triplet, stable thanks to the accidental symmetries of the Standard Model.
I will review the relevant phenomenology for relic density calculations, direct and indirect searches. Then, I will present an analysis of the reach for such a particle at the highluminosity LHC, and at an 100 TeV pp collider. 
Mar 02 2015
14:30 
ICTP, Euler Room

Alfredo Urbano & others
()


ABSTRACT: 
Feb 18 2015
16:00 
Room 005

Francesco Sannino
(CP3  Origins)

Rethinking Naturalness: The Interacting Ultraviolet Safe Behaviour of GaugeYukawa Theories 
ABSTRACT: I will critically introduce, classify and discuss the fundamental open issues related to either composite or elementary extensions of the standard model. As for the progress I will exhibit, among other things, the first proof of existence of nonsupersymmetric and nonasymptotically free 4D GaugeYukawa theories (structurally similar to the standard model) which are UV finite thanks to the existence of an exact interacting quantum UV fixed point in the gauge, Yukawa and scalar selfcouplings. The quantum moduli space of the theory will also be precisely determined. Theories with this behaviour have been searched for on the lattice for the past several decades. Our results show the critical ingredients that are needed to construct new classes of fundamental, according to Wilson, theories featuring elementary scalars. I will then comment on the wide phenomenological impact of this discovery. 
Feb 04 2015
16:00 

Daniele Montanino
(Università del Salento ed INFN, sez. di Lecce)

Neutrinos: results and perspectives 
ABSTRACT: Neutrino Physics has been one of the most exciting field of research in the last years. Through the mechanism of neutrino oscillations, neutrinos have proved to be massive and to be mixed to each other. The mass square differences and the mixing angles have been measured with high precision. However, many problems are still open: what are the absolute neutrino masses? What is the correct mass hierarchy? Do neutrinos violate CP symmetry? Are neutrino Maiorana particles (i.e. they coincide with their own antiparticles). Other puzzles open a new question: are there new sterile neutrino "states" mixed with the "active" ones? In this seminar I briefly overview the known and unknown in Neutrino Physics. 
Jan 14 2015
16:00 
Room 128129

Roberto Auzzi
(CERN  Geneve)

The local renormalization group equation in superspace 
ABSTRACT: 
Dec 10 2014
16:00 
Room 005

Francesco Bigazzi
(INFN Pisa)

Holographic QCD with Dynamical Flavors 
ABSTRACT: Gravity solutions describing the WittenSakaiSugimoto model of holographic QCD with dynamical flavors are presented. The field theory is studied in the Veneziano limit, at first order in the ratio of the number of flavors and colors. The gravity solutions are analytic and dual to the field theory either in the confined, low temperature phase or in the deconfined, high temperature phase with small baryonic charge density. The phase diagram and the flavor contributions to vacuum (e.g. string tension and hadron masses) and thermodynamical properties of the dual field theory are then deduced. The phase diagram of the model at finite temperature and imaginary chemical potential, as well as that of the unflavored theory at finite theta angle are also discussed in turn, showing qualitative similarities with recent lattice studies. Interesting degrees of freedom in each phase are discussed. 
Dec 03 2014
16:00 
Room 005

Marco Bochicchio
(Univ. Rome)

An asymptotic solution of largeN QCD, and of largeN n=1 SUSY YM 
ABSTRACT: 
Dec 01 2014
14:30 
ICTP Euler Lecture Room

Jacobo Lopez Pavon & others
()


ABSTRACT: 
Nov 19 2014
16:00 
Room 005

Luca Merlo
(UAM and IFT)

Higgs particle: elementary or not? 
ABSTRACT: With the discovery of a scalar resonance at ATLAS and CMS, the understanding of the electroweak symmetry breaking origin seems a much closer goal. Deviations from SM couplings are different for theories of new physics based on a nonlinear realisation of the SU(2)xU(1) gauge symmetry breaking and those assuming a linear realisation. I will review and compare the effective Lagrangians of the linear and nonlinear realisations and discuss some phenomenological signals. 
Jul 30 2014
16:00 
Room 005

Kai Schmitz
(IPMU, Tokyo)

Dynamical Fractional Chaotic Inflation 
ABSTRACT: In view of the recent BICEP2 data, chaotic inflation based on a simple monomial potential, V(phi) ~ phi^p, is certainly among the most attractive inflationary models capable of generating a sizeable tensortoscalar ratio r. Here, ordinary perturbative QFT, however, only admits positive integer values for the power p. In order to obtain fractional values, such as p = 2/3 or p = 2/5, one conventionally has to rely on the mechanism of axion monodromy in string theory. As I will demonstrate in this talk, this is not necessarily so. In fact, in strongly interacting supersymmetric gauge theories, it turns out to be possible to dynamically generate inflation potentials featuring almost arbitrary fractional powers via the effect of dimensional transmutation. This opens up the intriguing possibility that inflation is nothing but a mere consequence of strong dynamics around the scale of grand unification. A very precise determination of the inflationary CMB observables would then directly allow to pinpoint the gauge structure of the inflaton sector. 
Jul 09 2014
16:00 
Room 005

Yue Zhao
(SLAC and Stanford)

TBA 
ABSTRACT: 
Jul 09 2014
16:00 
Room 005

Yue Zhao
(Stanford)

A Parametrically Enhanced Hidden Photon Search 
ABSTRACT: Many theories beyond the Standard Model contain hidden photons. A light hidden photon will generically couple to the Standard Model through a kinetic mixing term, giving a powerful avenue for detection using "LightShiningThroughAWall"type transmission experiments with resonant cavities. All previous theoretical and experimental work made use only of the transverse modes of the hidden photon. We demonstrate that, with an appropriately designed experimental geometry, transmission of the longitudinal mode of the hidden photon is parametrically enhanced over transmission of the transverse modes. This significantly improves such experiments. We present a general method for calculating the expected signal, extending the previous literature to include the longitudinal mode. While optical experiments such as ALPS are unable to take useful advantage of this enhancement, the reach of existing microwave cavity experiments such as CROWS is significantly enhanced beyond their published results. Future microwave cavity experiments may be designed with an appropriate geometry to take full advantage of the longitudinal mode. This would allow a powerful probe of unexplored hidden photon parameter space, many orders of magnitude beyond current limits, including significant regions where the hidden photon can be dark matter. 
Jun 18 2014
16:00 
Room 128129

Robert Foot
(Melbourne U.)

How mirror dark matter might explain early Universe cosmology, galaxy structure, and direct detection experiments 
ABSTRACT: Mirror dark matter is a very special type of dark matter candidate motivated by particle physics. Mirror dark matter has both dissipative and nondissipative self interactions, leading to nontrivial halo dynamics. It is argued that such halo dynamics can explain the properties of dark matter on galaxy scales which have been inferred from observations. Implications for cosmology and direct detection experiments are also discussed. 
Jun 11 2014
16:00 
Room 005

Borut Bajc
(JSI, Ljubljana)

E6: the ultimate GUT 
ABSTRACT: In spite of being around for almost as long as SU(5) and SO(10), the E6 grand unified theory is much less studied. In this seminar I will review what is known about it, and propose a complete and realistic renormalizable supersymmetric theory. I will motivate why it is a candidate for being the minimal E6 model, and speculate on possible alternatives. 
May 28 2014
14:00 
Room 005

Gabriele Veneziano
(CERN)

Ultrahighenergy gravitational scattering: where do we stand? 
ABSTRACT: I will give an overview on what we have learned so far on the Smatrix for the ultrahighenergy gravitational scattering of particles, strings, and branes. I will then compare the results to classical expectations and mention the problems that still need to be solved in order to arrive at an informationpreserving description of gravitational collapse. 
May 07 2014
16:00 
Room 005

Pietro Slavich
(Paris, LPTHE)

Split SUSY and the Higgs after LHC8 
ABSTRACT: I will review how the findings (and lack thereof) of the first run of the LHC experiments encourage us to consider "unnatural" SUSY scenarios with heavy scalars. In particular, I will present a "Fake Split SUSY" scenario descended from a nonminimal SUSY model with Dirac gaugino masses, and I will discuss how the phenomenology of this scenario differs from the one of conventional Split SUSY. 
Apr 30 2014
16:00 
Room  005

Adam Falkowski
(LPT, Orsay)

Exotic Higgs Decays 
ABSTRACT: I will discuss the possibility of the LHC observing Higgs decays that are not predicted within the Standard Model. I will describe some models where the branching fraction for exotic Higgs decays can be significant without violating any existing experimental constraints. The main focus will be on the sensitivity of the 4lepton final state to exotic Higgs decays. I will show that the current ATLAS and CMS 4lepton data already probe a nontrivial parameter space of certain new physics scenarios, and discuss the discovery reach in the coming LHC run. 
Apr 23 2014
16:00 
Room 005

Sacha Davidson
(IPN, Lyon)

Axions, WIMPs and Red Herrings 
ABSTRACT: The axion is a pseudogoldstone boson, originally introduced to solve the strong CP problem of QCD. Despite its mass of order m_nu, it can contribute to cold dark matter, due to nonthermal production mechanisms in the early Universe. Axions grow Large Scale Structure in the linear regime like WIMPs, but could behave differently during nonlinear
structure formation. I will touch upon some scenarios and results from the literature about galactic halos made of axions, and argue that the issue of axion Bose Einstein condensation is a red herring. 
Apr 16 2014
16:00 
SISSA  Room 005

Carlo Meneghelli
(DESY)

MayerCluster Expansion of Instanton Partition Functions and Thermodynamic Bethe Ansatz 
ABSTRACT: In arXiv:0908.4052, Nekrasov and Shatashvili pointed out that the N=2 instanton partition function in a special limit of the Omegadeformation parameters is characterized by certain thermodynamic Bethe ansatz (TBA) like equations.In this talk I will present an explicit derivation of this fact as well as generalizations to quiver gauge theories. The TBA equations derived entirely within gauge theory have been proposed to encode the spectrum of a large class of quantum integrable systems. I will conclude with some remarks on this correspondence. 
Apr 11 2014
14:00 
Room 137

Aaron Vincent
(Valencia U., IFIC)

Solar dark matter: beyond standard models 
ABSTRACT: In this talk I will discuss the effect of nonstandard DMSM couplings on the search for dark matter using the Sun. The DMSM crosssection is typically taken to be a constant; however, they generically depend on the kinematic quantities s, t and u, which in the nonrelativistic limit can be seen as the relative DMnucleus velocity v_rel and the transferred momentum q (or recoil energy E_R). Depending on the operator, these terms can dominate and lead to vastly different phenomenology, and can even help reconcile conflicting direct detection results. After introducing these interactions, I will describe the effect of dark matter in the Sun, and show that the parameter space explored in such studies is in many ways complementary to earthbased experiments. I will show that heat conduction by DM trapped in the sun can have a nonnegligible impact on solar structure, giving us new ways of measuring the parameters of the dark sector. I will conclude with a discussion of the Solar Composition Problem, and how dark matter is a prime candidate to resolve this outstanding issue and how, for the second time in half a century, a great puzzle in solar astronomy may lead to the discovery of new physics beyond the standard model. 
Apr 02 2014
16:00 
SISSA  Room 005

Jamie Tattersall
(University of Heidelberg)

CheckMATE: Confronting your Favourite New Physics Model with LHC Data 
ABSTRACT: In the first three years of running, the LHC has delivered a wealth of new data that is now being analysed. With over 20 fb−1 of integrated luminosity, both ATLAS and CMS have performed many searches for new physics that theorists are eager to test their model against. However, tuning the detector simulations, understanding the particular analysis details and interpreting the results can be a tedious task. I will present the CheckMATE (Check Models At Terascale Energies) program package that accepts simulated event files in many formats for any new physics model. The program then determines whether the model is excluded or not at 95% C.L. by comparing to many recent experimental analyses. Furthermore the program can calculate confidence limits and provide detailed information about signal regions of interest. It is simple to use and the program structure allows for easy extensions to upcoming LHC results in the future. 
Mar 19 2014
16:00 
Room 005

Kalliopi Petraki
(NIKHEF, Amsterdam)

Selfinteracting and asymmetric dark matter 
ABSTRACT: Observations of the galactic and subgalactic structure of our universe support a shift from the collisionless cold dark matter paradigm. Dark matter with sizeable selfinteractions offers a compelling explanation of these observations. Particlephysics models of selfinteracting dark matter can be well accommodated within the asymmetric dark matter scenario. Asymmetric dark matter hypothesises that the relic dark matter abundance is due to an excess of dark particles over antiparticles, and allows for sizeable and direct couplings of dark matter to light mediators. In addition, the dark particleantiparticle asymmetry may be related to the baryon asymmetry of the universe, thus offering a dynamical explanation for the similarity of the dark and the ordinary matter abundances. Exploring the lowenergy phenomenology of selfinteracting asymmetric dark matter, including the effect on the dynamics of dark matter haloes, presupposes understanding the cosmology of these models, which can be quite involved. I will discuss the above, and illustrate them in the context of the atomic dark matter model. 
Mar 12 2014
16:00 
SISSA  Room 005

Satoshi Nawata
(Nikhef, Amsterdam)

Refined ChernSimons theory, knot homology and gauge theories 
ABSTRACT: Recently there has been a lot of progress in understanding the structure of knot homology and its relation to topological strings and gauge theories. In this talk, I will focus on refined ChernSimons theory and its relation to 4d and 3d gauge theories. Refined ChernSimons theory provides a way to compute HOMFLY homology of torus knots colored by symmetric representations. Via the geometric transition/engineering, these homological invariants admit interpretations as the 4d U(1) Nekrasov partition functions in the presence of a surface operator associated to knots. In addition, 3d/3d correspondence provides a way to regard these invariants as partition functions of 3d N=2 gauge theory. A handwritten note can be found in my website (https://sites.google.com/site/snawata/talks). 
Feb 19 2014
16:00 
SISSA  Room 005

Filipe R. Joaquim
(CFTP, IST, Universidade de Lisboa)

LFV after LHC12, MEG13 and theta_13 
ABSTRACT: In the last years there has been a lot of activity in seeking for possible relations between the physics responsible for neutrino mass generation and potential lepton flavour violating effects in chargedlepton decays. In this seminar I will discuss some issues related with charged lepton flavour violation (cLFV) in the context of the seesaw mechanism(s), and present some constraints on the parameter space taking into account the latest data coming from neutrino oscillation experiments, from the LHC and from experiments searching for cLFV decays (MEG, Bfactories,…). 
Feb 05 2014
16:00 
SISSA  Room 137

Andrea Wulzer
(University of Padova)

An Equivalent Gauge and the Equivalence Theorem 
ABSTRACT: I describe a covariant formulation of massive gauge theories in which the longitudinal polarization vectors do not grow with the energy so that the energy and coupling powercounting is completely transparent at the level of individual Feynman diagrams, with obvious advantages both at the conceptual and practical level.
Since powercounting is transparent, the highenergy limit of the amplitudes involving longitudinal particles is immediately taken, and the Equivalence Theorem is easily demonstrated at all orders in perturbation theory. Since the formalism makes the Equivalence Theorem selfevident, and because it is based on a suitable choice of the gauge, we can call it an ``Equivalent Gauge''. 
Jan 22 2014
16:00 
SISSA  Room 005

Isabella Masina
(Universita di Ferrara and INFN)

Possible Implications of the Observed Value of the Higgs Boson Mass 
ABSTRACT: I will discuss the issue of the stability of the electroweak vacuum in the Standard Model and its minimal extension including neutrinos. The recent measurement of the Higgs boson mass indeed allows to extrapolate the Higgs potential up to high energies. Possible applications to Higgs inflation models will be also discussed. 
Dec 04 2013
14:30 
SISSA  Room 5

SISSA Postdocs
(SISSA)

Postdoc Day  14:3017:30 
ABSTRACT: 
Nov 27 2013
16:00 
SISSA  Room 005

Alejandro Ibarra
(TU Munich)

Searching for spectral features in the gammaray sky 
ABSTRACT: TBA 
Nov 21 2013
14:00 
SISSA  Room 135

Jernej Kamenik
(Univ. Ljubljana)

Dark side of Higgs boson 
ABSTRACT: I will discuss the impact of hypothetical new neutral light particles on the tiny width of a light Higgs boson. To this end, I will review the possible signatures in the Higgs decay modes with missing energy, including all the relevant effective interactions, whether renormalizable or not. This includes the fully invisible Higgs boson decay, as well as modes with SM gauge bosons or fermions in the final state. In many cases, simply preventing these modes from being dominant suffices to set tight modelindependent constraints on the masses and couplings of the new light states. Then I will apply this analysis to Higgs portal models of dark matter (DM), where DM is light enough to contribute to invisible Higgs decays. I will show that DM can be a thermal relic only if there are additional light particles present with masses below a few 100 GeV. Three concrete examples of viable Higgs portal models of light DM will be presented where the invisible Higgs decay constraint is not too restrictive, because it is governed by different parameters than the relic abundance. Implications of additional light particles for flavor violation and collider searches will be briefly discussed. 
Sep 17 2013
14:15 
SISSA  Room 005

Clay Cordova
(Harvard U.)

Line Defects in N=2 QFT 
ABSTRACT: 
Sep 04 2013
16:00 
SISSA  Room 137 (unusual room)

Shigeki Matsumoto
(IPMU)

Pure Gravity Mediation Model and its phenomenology 
ABSTRACT: Recent results of the LHC (at Higgs and BSM searches) may indicate that the SUSY scale is much heavier than expected before. The Pure Gravity Mediation Model (PGM) is one of SUSY breaking models which realizes such a highscale SUSY scenario within the simplest setup. In the highscale SUSY scenario, the most important question is how we can test the model or what kind of experiments can rule out the model. A key particle is the wino, which is nothing but the dark matter candidate in the model, so that phenomenology of the wino dark matter is very important to answer the above question. After introducing the PGM model, I therefore discuss some phonologies of the wino dark matter, namely, collider (LHC) signals, direct detection signal, and indirect detection signals (using gammarays) of the wino dark matter. 
Aug 21 2013
16:00 
005  SISSA

MuIn Park
(Kunsan National U.)

ChernSimons Theory, Virasoro Algebra, and Black Hole Entropy 
ABSTRACT: 
Jul 31 2013
16:00 
005  SISSA

OKab Kwon
(Sungkyunkwan U., Ewha Womans U)

On the gravity dual of the massdeformed ABJM theory 
ABSTRACT: I will explain about the construction of ${cal N}=2,4$ supersymmetric abelian projections of the ${cal N}=6$ massdeformed ABJM theory. There are welldefined dual background geometries for the ${cal N}=2$ abelian theory, while those geometries are unclear for the ${cal N}=4$ abelian theory. After I explain the basic properties of the abelian projected ABJM theory, I will talk about the gravity dual property of the vacua of the massdeformed ABJM theory which are proven to have onetoone correspondence with the ${mathbb Z}_k$ quotient of LinLuninMaldacena geometries. One special vacuum of the massdeformed ABJM theory is weakly curved at every point of the entire space transverse to the M2branes in the large $N$ limit. Based on this property I will discuss about the dual gravity of the massdeformed ABJM theory. 
Jul 10 2013
16:00 
005  SISSA

Marco Bochicchio
(INFNRome, SNSPisa)

Glueball and meson propagators of any spin in large N QCD 
ABSTRACT: We prove an asymptotic structure theorem for glueball and meson propagators of any spin in largeN QCD and in n=1 SUSY QCD with massless quarks,
that determines asymptotically the residues of the poles of the propagators in terms of their anomalous dimensions and of the spectral density of the masses.
The asymptotic theorem follows by the severe constraints on the propagators in largeN QCD with massless quarks, or in any largeN confining asymptoticallyfree
gauge theory massless in perturbation theory, that arise by perturbation theory in conjunction with the renormalization group and by the OPE on the ultraviolet side.
The asymptotic theorem is inspired by a recently proposed Topological Field Theory (TFT) underlying largeN pure YM, that computes sums of the scalar and of the
pseudoscalar correlators satisfying the asymptotic theorem and that implies for the largeN joint scalar and pseudoscalar glueball spectrum exact linearity in the masses squared.
On the infrared side we test the prediction of the exact linearity in the TFT by MeyerTeper lattice numerical computation of the masses of the lowlying glueballs in SU(8) YM,
finding accurate agreement.
Besides, we employ the aforementioned ultraviolet and infrared constraints in order to compare critically the scalar or pseudoscalar glueball propagators computed
in the framework of the AdS String/largeN Gauge Theory correspondence with those of the TFT underlying largeN YM.
We find that only the TFT satisfies the ultraviolet and infrared constraints. 
May 29 2013
16:00 
137  SISSA

Kazunobu Maruyoshi
(Caltech)

N=1 Dynamics with T_N SCFTs 
ABSTRACT: 
May 22 2013
16:00 
SISSA  Room 005

Elli Pomoni
(DESY)

Integrability beyond the N=4 paradigm 
ABSTRACT: N = 2 SuperConformal QCD (SCQCD) is perhaps the simplest theory outside the N = 4 "universality class" that we can attempt to study holographically.
N = 2 SCQCD is continuously connected to the N = 4 class by an interpolating family of N = 2 SCFT. We present the study of spin chains, the complete oneloop Hamiltonian and higherloop results. We then to ask the question of integrability. We explain why a closed SU(2,12) sector, which exists in any N= 2 superconformal gauge theory, should be integrable to all loops. 
Apr 24 2013
16:00 
SISSA  Room 005

Jose Juknevich
(Weizmann Institute, Rehovot)

Top Tagging at the LHC 
ABSTRACT: Top tagging is a recent approach to identifying boosted hadronic top quarks. In this talk I will summarize some of those techniques and present some of my contributions to the development of a top tagger and their different applications to searches for t bar{t} resonances. 
Apr 10 2013
9:45 
SISSA  Room 128/129

Julien Lesgourgues
(CERN/Lausanne)

Neutrino Cosmology: status after Planck (Combined APP/TPP seminar, unusual time and location) 
ABSTRACT: Neutrino physics illustrates beautifully the interplay between cosmology and particle physics. I will review the most plausible impacts of neutrinos (active and eventually sterile) on cosmological observables, and especially on CMB anisotropies and on the large scale structure of the universe. I will discuss the implications of the recent Planck results for neutrino physics, and show what can be expected from future experiments. 
Mar 27 2013
16:00 
SISSA  Room 005

Kostas Skenderis
(Universiteit van Amsterdam)

A holographic view of the very early universe 
ABSTRACT: In this talk I will give an overview of holographic cosmology. I will
first discuss standard inflation, show that it is holographic and
discuss the new insights that come from this. I will then present new
holographic models that describe a universe that was
nongeometric at early times and describe the phenomenology and the
observational signatures of these models. 
Mar 20 2013
16:00 
SISSA Room 128/129 (Unusual Room)

Carlo Rovelli
(Marseille)

(Combined APP/TPP seminar) 
ABSTRACT: 
Mar 06 2013
16:00 
SISSA  Room 005

JunBao Wu
(Chinese Academy of Sciences)

Integrability of Marginally Deformed ABJM Theories 
ABSTRACT: We study the anomalous dimensions for operators in the scalar sector of betadeformed ABJ(M) theories. We show that the anomalous dimension matrix at twoloop order gives an integrable Hamiltonian acting on an alternating SU(4) spin chain with the spins at odd lattice sides in the fundamental representation and the spins at even lattices in the antifundamental representation. We get a set of betadeformed Bethe ansatz equations which give the eigenvalues of Hamiltonian of this deformed spin chain system. Based on our computations, we also extend our study to nonsupersymmetric threeparameter gammadeformation of ABJ(M) theories and find that the corresponding Hamiltonian is the same as the one in betadeformed case at twoloop level in the scalar sector. This talk is based on joint work with Song He. 
Feb 27 2013
16:00 
SISSA  Room 005

Francesco Riva
(IFAE Barcelona)

Has Supersymmetry been discovered on the 4th of July? 
ABSTRACT: Recent LHC searches have provided strong evidence for the Higgs, a boson whose gauge quantum numbers coincide with those of a SM fermion, the neutrino. This raises the question of whether Higgs and neutrino can be related by supersymmetry. I will show explicitly the implications of models where the Higgs is the sneutrino: from a theoretical point of view an Rsymmetry, acting as lepton number is necessary; on the experimental side, squarks exhibit novel decays into quarks and leptons, allowing to differentiate these scenarios from the ordinary MSSM. 
Jan 30 2013
16:00 
SISSA  Room 005

David Straub
(Mainz)

Indirect constraints on composite Higgs models 
ABSTRACT: The discovery of a Higgslike scalar particle with a mass of 125 GeV has reinforced the need to address the gauge hierarchy problem: in the absence of supersymmetry, a fundamental scalar particle would require an unnatural amount of finetuning. This problem can be solved if the Higgs is a composite particle of a new strong interaction, in particular if it arises as a pseudo NambuGoldstone boson. But even then, a moderate degree of finetuning calls for relatively light
fermionic resonances. Apart from direct searches for such resonances, such models are strongly constrained by electroweak precision observables and flavour physics. I will present an overview of electroweak, flavour and collider constraints on composite Higgs models, considering several choices for the electroweak representations, comparing flavoursymmetric models to flavouranarchic ones and identifying the least finetuned cases and their prospects. 
Jan 23 2013
16:00 
SISSA  Room 005

Lorenzo Calibbi
(Brussels)

Phenomenology of SUSY with intermediate scales 
ABSTRACT: The presence of new matter fields charged under the
Standard Model gauge group at intermediate scales below the Grand Unification scale modifies the renormalization group evolution of the gauge couplings. This can in turn significantly change the running of the Minimal Supersymmetric Standard Model parameters, in particular the gauging and the scalar masses. As a consequence of the modified running, the low energy spectrum can be strongly affected with observable phenomenological consequences. In particular, the parameter space with neutralino Dark Matter compatible with cosmological observations
get drastically modified. Moreover, I will discuss some observables that can be used to test the intermediate scale physics at the LHC in
a wide class of models. 
Jan 16 2013
15:00 
SISSA  Room 005

Simone Giacomelli
(Scuola Normale Superiore (SNS))

Singular points and confinement in SQCD 
ABSTRACT: In this talk I will revisit the study of singular points in N=2 SQCD with classical gauge groups. Generalizing a technique proposed recently by Gaiotto, Seiberg and Tachikawa we find that the low energy physics at the maximally singular points involves two superconformal sectors coupled to an infrared free SU(2) gauge group. Some of these points play a key role in understanding the properties of the theory when one softly breaks extended supersymmetry to N =1, adding a mass term for the chiral multiplet in the adjoint representation. I will discuss how confinement and chiral symmetry breaking are realized in these models. 
Dec 19 2012
16:00 
SISSA  Room 005

Eung Jin Chun
(KIAS)

LHC phenomenology of type II seesaw 
ABSTRACT: The type II seesaw mechanism introduces a Higgs triplet to explain
the observed neutrino masses and mixing. As a result, the model predicts
a peculiar signature of a doubly charged Higgs boson decaying to dileptons
which is one of the interesting search channels at the LHC as it can tell us about
the neutrino mass pattern.
In this talk, I will discuss some of the recent developments in the field
including the latest CMS result, a novel samesign tetralepton signal
coming from the tripletantitriplet oscillation, and modifications to the standard
Higgs properties induced by the presence of the Higgs triplet. 
Nov 28 2012
16:00 
SISSA  Room 005

Silvia Pascoli
(IPPP Durham)

Neutrino masses and mixing: from the present status to future quests 
ABSTRACT: In the past fifteen years a series of experiments has confirmed that neutrinos can oscillate between different flavors, implying that they have mass and mix. These results play a crucial role in our understanding of particle physics as they are the first solid evidence for physics beyond the Standard Model, with profound implications for the Universe and the laws which govern it.
We have just entered the precision era of neutrino physics in which crucial neutrino properties will be determined with great accuracy. In 2012 the last of the mixing angles to be measured, theta13, was discovered at reactor neutrino oscillation experiments with important consequences for the future searches of the neutrino mass hierarchy, CPviolation and deviations from the standard 3neutrino mixing scenario.
I will review the experimental results which indicate the existence of neutrino oscillations, their implications for our understanding of neutrino properties and the questions which we have to address in the coming future. I will give an overview of the exciting experimental program which is underway and how it will potentially answer the questions about the neutrino nature, their masses and mixing. 
Nov 21 2012
16:00 
SISSA  Room 005

Mark Goodsell
(Ecole Polytechnique, Paris)

The Higgs in Dirac gaugino models 
ABSTRACT: I will discuss the latest developments in the phenomenology of the minimal Dirac gaugino extension of the Standard Model/(N)MSSM, paying particular attention to the Higgs production and branching ratios. Such models have many advantages over their Majorana counterparts, such as increased naturalness and new couplings that can enhance the Higgs mass. The spectrumgeneratorgenerator SARAH has been updated to include Dirac gaugino masses, which now allows the full oneloop phenomenology of the models to be studied, of which the work I shall discuss is a first step. 
Nov 14 2012
14:30 
SISSA  Room 005

Jacopo LopezPavon
(SISSA)

Can heavy neutrinos dominate neutrinoless double beta decay? 
ABSTRACT: Neutrinoless double beta decay is the key experiment in order to understand whether neutrinos are Majorana or Dirac particles. We will review the role played by the extra states associated to the seesaw models in this process, focusing on the correlation among the different contributions. In particular, we will show why the contribution due to the exchange of heavy particles is generally subdominant. An interesting exception, which arises when the light neutrino contribution cancels out, will also be studied paying special attention to the relevant oneloop effects. 
Nov 14 2012
14:50 
SISSA  Room 005

Benedict von Harling
(SISSA)

The ScaleInvariant NMSSM and the 125 GeV Higgs boson 
ABSTRACT: The recent LHC discovery of a 125 GeV Higgslike state suggests that the minimal supersymmetric standard model must be modiﬁed in order to preserve naturalness. A simple extension is to include a singlet superﬁeld and consider the scaleinvariant NMSSM, whose renormalizable superpotential terms contain no dimensionful parameters. This extension not only solves the µproblem, but can easily accommodate a 125 GeV Higgs boson. We study the naturalness of the scaleinvariant NMSSM and show that TeV scale stop masses are still allowed in much of the parameter space with 5% tuning, a 20 TeV messenger scale and singletHiggs couplings lambda around one. For larger values of the singletHiggs coupling, which relieves the electroweak VEV tuning, an additional tuning in the Higgs mass limits increasing the (lightest) stop mass beyond 2 TeV. 
Nov 14 2012
15:10 
SISSA  Room 005

Wei Xue
(SISSA)

An optimistic CoGeNT analysis 
ABSTRACT: In this talk, I will briefly review dark matter direct detection.
Inspired by a recently proposed model of millicharged atomic dark matter (MADM), we analyze several classes of light dark matter models with respect to CoGeNT modulated and unmodulated data, and constraints from CDMS, XENON10 and XENON100. After removing the surface contaminated events from the original CoGeNT data set, we find an acceptable fit to all these data, using somewhat relaxed assumptions about the response of the null experiments at low recoil energies. We compare the fits of MADMan example of inelastic magnetic dark matterto those of standard elastically and inelastically scattering light WIMPs (eDM and iDM). The iDM model gives the best fit, with MADM close behind. The dark matter interpretation of the DAMA annual modulation cannot be made compatible with these results however. We find that the inclusion of a tidal debris component in the dark matter phase space distribution improves the fits or helps to relieve tension with XENON constraints. 
Nov 14 2012
15:30 
SISSA  Room 005

Alfredo Leonardo Urbano
(SISSA)

Top asymmetries, Higgs boson and new Dark Matter signals at LHC 
ABSTRACT: We present the status of some work in progress. In particular i) a possible connection between the top asymmetries and the radiative electroweak Higgs decays and ii) new Dark Matter signals at LHC through vector boson fusion processes will be discussed. 
Nov 14 2012
16:10 
SISSA  Room 005

Marja Hanussek
(SISSA)

Neutrino masses and LHC constraints in Rparity violating supersymmetric models & light stops at the LHC 
ABSTRACT: I will discuss how phenomenologically viable neutrino masses can be obtained in a Leptonnumber violating supersymmetric model while taking into account constraints from recent LHC results, most importantly from multilepton and Higgs searches. Furthermore I will shortly discuss the discovery potential of light stop scenarios at the 14TeV LHC and outline how these results may be used in order to reconstruct the superpotential coupling $tilde t_1  chi_1^pm  b$. 
Nov 14 2012
16:30 
SISSA  Room 005

Can Kozcaz
(SISSA)

The Refinement of the Topological Strings 
ABSTRACT: The recent advances in N=2 SUSY theories motivated the refinement of the topological string theory. One of the direct methods to compute the refined topological string partition function is the refined topological vertex. In this talk, the refined vertex will be introduced and some applications will be discussed. 
Nov 14 2012
16:50 
SISSA  Room 005

Michele Pinamonti
(SISSA)

Search for ttbar + Higgs events at ATLAS (LHC) 
ABSTRACT: ATLAS and CMS experiments recently discovered a new particle decaying into gammagamma and ZZ, compatible with the Standard Model Higgs boson with a mass around 125 GeV. Searches for the same particle in less important decay and production channels are therefore becoming more and more important to establish the couplings (and consequently the nature) of the new Higgslike particle. The observation of the ttH(>bb) channel, where the Higgs is produced in association with a pair of top quarks and decays to a pair of bottom quarks, would offer the possibility to isolate purely fermionic Higgs couplings. The large\r\namount protonproton collision data collected by the ATLAS experiment during the past two years at the centreofmass energies of 7 and 8 TeV at the LHC, the excellent performances of the detector and the sophisticated analysis techniques will hopefully allow to see and measure this challenging process. 
Oct 03 2012
16:00 
SISSA  Room 005

Enrico Bertuzzo
(IPhT CEA Saclay)

Do h>gamma gamma and gluon gluon > h taste like vanilla new physics? 
ABSTRACT: After an introduction on the current experimental status of the Higgs boson, I will study the effect of new vectorlike fermions on the gluon gluon > h and h > gamma gamma channels, in which the effect of new physics may be already showing up. In particular, I will analyze fermions in their smallest SU(2) representations, and the modifications to the previously mentioned channels in regions allowed by electroweak precision measurements. 
Sep 26 2012
16:00 
SISSA

Marco Nardecchia
(CP3 Origins)

On Partial Compositeness and the CP Asymmetry in Charm Decays 
ABSTRACT: Recently, the LHCb and CDF collaborations reported the measure of a direct CP asymmetry in D meson decays. In this talk we ask if new physics associated with Partial Compositeness could plausibly explain this result. The realization of Partial Compositeness is discussed in the context of the (nonsuy) composite Higgs models and within supersymmetry. 
Sep 19 2012
16:00 
SISSA  Room 005

Alexander Westphal
(DESY)

Building an explicit de Sitter 
ABSTRACT: 
Sep 05 2012
16:00 
SISSA  Room 005

Junbao Wu
(Institute of High Energy Physics, Chinese Academy of Sciences)

Holographic Correlation Functions of Giant Gravitons 
ABSTRACT: 
Jul 06 2012
16:30 
Euler Lecture Hall, ICTP

Sanved Kolekar
(IUCAA, India)

Some issues in horizon thermodynamics 
ABSTRACT: 
Jul 04 2012
9:00 
Room 128

ATLAS and CMS spokepersons
(CERN)

Update on the Standard Model Higgs searches in CMS and ATLAS 
ABSTRACT: 
Jun 27 2012
16:00 
Lecture Hall 005

Chiara Caprini
(CEA  Saclay)

Primordial magnetic fields: initial conditions and CMB anisotropy at large scales 
ABSTRACT: Large scale magnetic fields are ubiquitous in the universe. Observations of galaxies and clusters, even at high redshift, show that microGauss magnetic fields are present in these astrophysical objects, correlated on the same scale of the object itself. Recently, a lower bound on the magnetic field amplitude in voids has been established using gamma ray telescopes. However, the origin of these magnetic fields is still unknown: understanding when and how they formed, and how they evolved after formation is one of the problem of modern cosmology. This seminar focusses on the hypothesis that the rnmagnetic fields observed today in matter structures have been rngenerated in the primordial universe, during inflation or during an instantaneous causal process, like e.g. a phase transition. The neatest way to confirm the presence of a magnetic field of primordial origin would be to observe its trace in the cosmic microwave background. I will derive the initial conditions and the evolution of the metric perturbations generated both by an inflationary and by a rncausal magnetic field, with the aim of predicting the shape of the large scale temperature anisotropy that it would induce in the cosmic microwave background. 
Jun 26 2012
16:30 
Luigi Stasi Seminar Room, ICTP

Svjetlana Fajfer
(Jozef Stefan Institute, Ljubljana)

Light Color Scalars from Low Energy to Proton Decay 
ABSTRACT: 
Jun 25 2012
16:30 
Luigi Stasi Seminar Room, ICTP

Massimo Porrati
(NYU)

On the Unitarity of Critical Gravity, other HigherDerivative Theories, and High Spin RandallSundrum Theories 
ABSTRACT: Special limits of theories with higher time derivatives in Anti de Sitter space exhibit interesting features: they realize logarithmic representations of the conformal algebra and they possess a structure akin to gauge theory. These results can be obtained by a simple study of the scalar product of free fields. This study shows that "critical" gravity in dimension larger than 3 is nonunitary, but that the spectrum of certain other higher derivative theories, such as the FlatoFronsdal singleton dipole theory, contains a unitary subsector. Unitarity of a high spin generalization of the RandallSundrum construction will be also discussed. 
Jun 21 2012
16:30 
Euler Lecture Hall, ICTP

Dilip K. Ghosh
(IACS, Kolkata, India)

Using Jet Substructure at the LHC to Search for the Light Higgs Bosons of the CPViolating MSSM 
ABSTRACT: 
Jun 20 2012
16:00 
Lecture Hall 005

Massimo Porrati
(NYU)

Surprises with Interacting High Spin Particles 
ABSTRACT: In this talk, old and new no go theorems that severely constrainrnpossible interactions of massless high spin particles will be reviewed. Massive particles can interact with gauge fields and gravity, but they are often plagued by pathologies such as superluminal propagation in nontrivial backgrounds. The last part of the talk uses the example of open string theory to show that such pathologies can be avoided by an appropriate choice of nonminimal interactions. 
Jun 13 2012
16:00 
Lecture Hall 005

Veronika Hubeny
(Durham University)

CFT probes of bulk geometry 
ABSTRACT: Motivated by the need for further insight into the emergence
of AdS bulk spacetime from CFT degrees of freedom, we explore the behaviour of probes represented by specific geometric quantities in the bulk. In particular, we study how deep into the bulk can various extremal surfaces anchored on the boundary reach, demonstrating that such surfaces cannot penetrate static black hole horizons. We then explore the properties of bulk causal wedge naturally associated with a given region on the boundary, focusing on a specific quantity which we dub the causal holographic information. 
Jun 01 2012
16:30 
Euler Lecture Hall  ICTP

Cumrun Vafa
(Harvard University, Cambirdge, USA)

Knots and Mirrors 
ABSTRACT: 
May 25 2012
16:30 
Euler Lecture Hall  ICTP

Andreas Weiler
(DESY, Hamburg)

Natural and flavorful SUSY at the LHC 
ABSTRACT: 
May 09 2012
16:00 
Room 005

Sven Heinemeyer
(Santander )

LHC Searches for Higgs and SUSY from a Theory Perspective 
ABSTRACT: 
Mar 28 2012
16:00 
Room 005

Wilfried Buchmueller
(DESY)

Spontaneous BL Breaking as the Origin of the Hot Early Universe 
ABSTRACT: 
Feb 08 2012
16:00 
Room 005

Andrea de Simone
(SISSA)

Electroweak light from dark matter 
ABSTRACT: The indirect searches for Dark Matter (DM) are based on
detecting excesses
in the fluxes of cosmic rays produced by DM annihilations in the galaxy. These fluxes can be significantly altered by the inclusion of electroweak gauge boson
radiation. I will discuss the situations where the effect of electroweak radiation is particularly important, and describe in more detail the cases when the DM resembles the bino or the wino of
supersymmetric models. I will also comment on the effective field theory formulation.

Sep 28 2011
16:00 
SISSA, Room 004

Jure Zupan
(University of Cincinnati)

Flavor symmetries and processes with tops 
ABSTRACT: 
Jun 15 2011
16:00 
SISSA, room 005

Sergey Sibiryakov
(INR, Moscow )

Technically natural dark energy from Lorentz breaking 
ABSTRACT: 
Jun 08 2011
16:00 
SISSA, Room 005

Christophe Grojean
(CERN )

Alternatives to the SM Higgs boson 
ABSTRACT: 
May 18 2011
16:00 
SISSA, room 004

Sabine Kraml
(LPSC, Grenoble)

Light mixed sneutrino dark matter 
ABSTRACT: 
May 11 2011
16:00 
SISSA, Room 005

Javier Tarrio
(Utrecht University )

The open string membrane paradigm in AdS/CFT 
ABSTRACT: 
May 04 2011
16:00 
SISSA, Room 005

Christoph Luhn
(Southampton University)

NonAbelian discrete family symmetries from SU(3) 
ABSTRACT: 
Apr 20 2011
16:00 
SISSA, room 005

Alessandro Vichi
(EPFL)

Exploring Conformal Field Theories 
ABSTRACT: 
Apr 13 2011
16:00 
SISSA, Room 005

David Marsh
(Cornell University )

Sequestering in String Compactifications 
ABSTRACT: I will describe recent efforts to understand the mediation of supersymmetry breaking in compactifications of string theory whose moduli are stabilized by nonperturbative effects. Geometric separation between the visible and the supersymmetry breaking sectors has been argued to lead to sequestering, but I will describe how moduli stabilization effects may spoil sequestering. In some of the phenomenologically most successful models, the effects of moduli
stabilization can be significant and may induce nonnegligible CPviolation and flavor changing neutral currents as well as problems for electroweak symmetry breaking. 
Apr 06 2011
16:00 
SISSA, Room 005

Bennie F. L. Ward
(Baylor University)

Planck Scale Cosmology and Asymptotic Safety in Resummed Quantum Gravity: An Estimate of Lambda 
ABSTRACT: In Weinberg's asymptotic safety approach to quantum gravity, a finite dimensional critical surface for a UV stable fixed point generates a theory of quantum gravity with a finite number of physical parameters. We argue that, in a recently formulated extension of Feynman's original formulation of the theory, which we have called resummed quantum gravity, we recover this fixedpoint UV behavior from an exact rearrangement of the respective perturbative series. Our the results are consistent both with the exact field space Wilsonian renormalization group results of Reuter et al. and with recent Hopfalgebraic DysonSchwinger renormalization theory results of Kreimer. Our first "first principles" predictions of the respective dimensionless gravitational and cosmological constants support the Planck scale cosmology advocated by Bonanno and Reuter as well. We arrive at the "first principles" estimate of the cosmological constant ρ_{Λ} ≅ (2.400 x 10^{3} eV)^{4} 
Mar 23 2011
16:00 
SISSA, Room 005

Giuseppe Policastro
(LPT Ecole Normale Superieure)

Optical properties of holographic relativistic plasmas 
ABSTRACT: I will discuss how the gauge/gravity holographic correspondence can be used to study the electromagnetic response and optical properties of a certain class of media, namely strongly coupled relativistic plasmas; in particular it can be shown that they exhibit the phenomenon of negative refraction in a certain range of frequencies, that is observed in artificially realized metamaterials. I will also discuss the relevance of the results for nonrelativistic systems, e.g. Fermi liquids. 
Mar 16 2011
16:00 
SISSA, Room 005

Roberto Contino
(Roma La Sapienza)

The effect of resonances in strong WW scattering 
ABSTRACT: 
Mar 09 2011
16:00 
SISSA, Room 005

Umberto De Sanctis
(SISSA)

One year with the ATLAS experiment at LHC: measurements, limits and hopes 
ABSTRACT: In this seminar, I will review the principal measurements of the ATLAS experiment at Large Hadron Collider at CERN with the data collected in 2010. The attention will be mainly brought to the Standard Model physics and the searches for the Higgs boson, Supersymmetry and many other signatures related to different scenarios of physics "beyond the Standard Model". The prospects for 2011 will be also presented 
Mar 02 2011
16:00 
SISSA, room 005

Kazuo Hosomishi
(Kyoto University)

AGT on the Sduality Wall 
ABSTRACT: Threedimensional gauge theory T[G] arises on a domain wall between fourdimensional N=4 SYM theories with the gauge groups G and its Sdual G^{L}. We argue that the N=2^{*} mass deformation of the bulk theory induces a massdeformation of the theory T[G] on the wall. The partition functions of the theory T[SU(2)] and its massdeformation on the threesphere are shown to coincide with the transformation coefficient of Liouville onepoint conformal block on torus under the Sduality. 
Feb 07 2011
16:00 
SISSA, room 005

Riccardo Barbieri
(SNS, Pisa)

Beyond the standard MSSM 
ABSTRACT: If supersymmetry is relevant at the Fermi scale, the lack of any direct signal so far may require going beyond the Minimal Supersymmetric Standard Model. I analyze a simple and concrete extension of the MSSM that takes these issues, including a way to address the flavour and the CP problems. In its fully natural range of parameters, the expected signals for LHC, dark matter and flavour physics are clear and generally quite different from the ones of the MSSM. Gauge coupling unification may be only approximate. 
Jan 26 2011
10:30 
SISSA, Room 005

Diego RodriguezGomez
(Technion)

A holographic approach to phase transitions 
ABSTRACT: Possible applications of the gauge/gravity duality to condensed matter systems have attracted a great attention over the last few years. In particular, holographic descriptions of phase transitions in strongly coupled systems have attracted much attention. Following mostly a bottomup approach, in this talk we will study some such models which can accommodate a wide range of critical exponents, thus potentially describing a large class of systems. We will also discuss the case of pwave condensates by focusing on a mild deformation of gauged 5d SUGRA. In fact our results can shed some light into phases of Rcharged black holes. 
Jan 23 2011
16:00 
SISSA

Samoil M. Bilenky
(Dubna, JINR & Munich, Tech. U.)

TBD 
ABSTRACT: 
Jan 19 2011
16:00 
SISSA, Room 005

Michele Redi
(CERN)

Low Scale Flavor Gauge Symmetries 
ABSTRACT: I will discuss the possibility of gauging the Standard
Model flavor group. Anomaly cancellation leads to the addition of
fermions whose mass is inversely proportional to the known fermion
masses. In this case all flavor violating effects turn out to be
controlled roughly by the Standard Model Yukawas, suppressing
transitions for the light generations. Due to the inverted hierarchy
the scale of new flavor gauge bosons could be as low as the
electroweak scale without violating any existing bound but accessible
at the Tevatron and the LHC. The mechanism of flavor protection
potentially provides an alternative to Minimal Flavor Violation, with
flavor violating effects suppressed by hierarchy of scales rather
than couplings. 
Jan 12 2011
16:00 
SISSA

Driba D. Tolla
(Sungkywnkwan University)

Interaction between multiple M2branes and bulk form fields in the context of ABJM model 
ABSTRACT: 
Dec 15 2010
16:00 
SISSA, Room 005

I. Amado, K. Maruyoshi, I. Smolic, M. Spinrath
(SISSA)

Postdoc Day 
ABSTRACT: Anomalous hydrodynamics from holography: the chiral vortical conductivity  AGT Relation, Matrix Model, and Integrable System  Black hole entropy in the presence of gravitational ChernSimons terms  Aspects of Flavour Model Building in Supersymmetric Grand Unification 
Jul 21 2010
16:00 
SISSA, Room 137

Stefano Rigolin
(University of Padua, Italy)

A "novel" symmetry breaking mechanism in extra dimensions 
ABSTRACT: We review the basic notions of compactification in the presence of a background flux.
In extradimentional models with more than five dimensions, Scherk and Schwarz boundary conditions have to satisfy 't Hooft consistency conditions.
Different vacuum configurations can be obtained, depending whether trivial or nontrivial 't Hooft flux is considered.
The presence of the "magnetic" background flux provides, in addition, a mechanism for producing fourdimensional chiral fermions.
Particularizing to the sixdimensional case, we calculate the oneloop effective potential for a U(N) gauge theory on M4 x T2.
We firstly review the well known results of the trivial 't Hooft flux case, where oneloop contributions produce the usual Hosotani dynamical symmetry breaking.
Finally we applied our result for describing, for the first time, the oneloop contributions in the nontrivial 't Hooft flux case. 
Jul 14 2010
16:00 
SISSA, Room 137

Giuliano Panico
(ETH Zurich, Switzerland)

Mesons and Baryons from Holographic QCD 
ABSTRACT: By following an "inverse" holographic approach we construct a 5D effective theory that captures several aspects of hadron physics in the large Nc limit.
Baryons arise in this set up as calculable 5D Skyrmions.
In spite of the simplicity of the model and of the limited number of free parameters, we get a surprisingly good agreement with the experimental data for many mesonic and baryonic observables. 
May 26 2010
16:00 
SISSA, Room 137

Kazunobu Maruyoshi
(Yukawa Institue, Japan)

SeibergWitten Theory via Penner Type Matrix Model 
ABSTRACT: We discuss the Penner type matrix model recently proposed by Dijkgraaf and Vafa for a possible explanation of the relation between twodimensional CFT and Nekrasov partition function of N=2 gauge theory.
We see the spectral curve of the matrix model in planar limit correctly matches with the SeibergWitten curve of SU(2) quiver gauge theory.
We calculate the planar free energy of this matrix model for the simplest quiver case, that is, SU(2) gauge theory with four flavors and see the precise agreement with the gauge theory prepotential.
We also discuss the decoupling of massive flavors from the matrix model and derive matrix models describing asymptotically free N = 2 gauge theories.
(Ref: Tohru Eguchi and Kazunobu Maruyoshi, arXiv:0911.4797 [hepth]) 
May 19 2010
16:30 
SISSA, Room 137

Sebastian Cassel
(University of Oxford, UK)

The fine tuning guide for SUSY searches 
ABSTRACT: Low energy supersymmetry can be theoretically motivated as a solution to the hierarchy problem of the Standard Model if the superpartner states are not too heavy. The nonobservation of SUSY and precision tests then introduces some tension in the attempt for naturalness. I will present a study of the amount of fine tuning at 2loop order in the constrained MSSM and discuss which regions of the parameter space are preferred on naturalness grounds. The implications for the most promising collider and dark matter search strategies for observing SUSY will also be considered. 
May 12 2010
16:30 
SISSA, Room 137

Giovanni Villadoro
(CERN)

Simple Z' in the early LHC 
ABSTRACT: Extra vector bosons are a common feature of many extensions of the Standard Model and represent one of the easiest smoking gun of new physics to look for. I will discuss present bounds from direct and indirect searches on the existence of extra spin1 particles coupled to the Standard Model fields through renormalizable interactions and the possibility of an early discovery at the LHC. 
May 05 2010
16:30 
SISSA, Room 137

Carlos Nuñez
(Swansea University, Wales)

Aspects of Gauge Strings Duality 
ABSTRACT: I will discuss recent developments in the duality between gauge fields and Strings. 
Mar 17 2010
16:30 
SISSA, Room D

Miguel Paulos
(DAMTP, Cambridge, UK)

Viscosity and conductivity in general theories of gravity 
ABSTRACT: Recently there has been great interest in calculating transport coefficients for field theories at large coupling, using AdS/CFT.
In this talk I will discuss recent work showing how to use the membrane paradigm to easily compute the shear viscosity and conductivity in arbitrary gravity theories.
In a certain sense these can be thought of as effective couplings at the black hole horizon dual to the field theory plasma. An explicit Waldlike formula for these couplings is given for a large class of generalized gravity theories. 
Mar 03 2010
16:30 
SISSA, Room D

Liuba Mazzanti
(Santiago de Compostela University)

Holographic gluon plasma hydrodinamics from 5d DilatonGravity 
ABSTRACT: 
Feb 24 2010
16:30 
SISSA, Room D

Timo Weigand
(Heidelberg University, Germany)

Compact Ftheory GUT model building 
ABSTRACT: 
Feb 17 2010
16:30 
SISSA, Room D

Umberto De Sanctis
(SISSA)

First results with the ATLAS detector at LHC 
ABSTRACT: In this talk, I will show the performances of the ATLAS detector and the first physical results with real data collected during the final month of 2009, after the restart of LHC. The possibility to discover high mass scalar resonances, within the chiral lagrangian framework, in the Vector Boson Scattering channel will also be discussed. 
Feb 10 2010
16:30 
SISSA, Room D

Alessandro Tomasiello
(University of Milano "Bicocca)

The gauge dual of Romans mass 
ABSTRACT: We review recent progress in constructing exact nonBPS solutions of 5D supergravity. The solutions we construct describe (multi) black holes and black rings as well as regular horinzonless solutions with the same asymptotic charges of nonBPS black holes. 
Jan 27 2010
16:30 
SISSA, Room D

Toshihiko Oto
(MaxPlanckInstitut fuer Physik, Muenchen)

Neutrino masses from higher than dimension five effective operators 
ABSTRACT: 
Jan 26 2010
16:00 
ICTP  Euler Lecture Hall

Sergio Cecotti
(SISSA)

Yukawa couplings in Ftheory and a Quantum residue formula 
ABSTRACT: 
Jan 13 2010
16:30 
SISSA, Room D

Pomita Ghoshal
(SISSA)

Determining the neutrino mass hierarchy via future atmospheric neutrino detectors 
ABSTRACT: The effect of the earth's matter on neutrinos passing through the earth modifies the neutrino oscillation probabilities and enhances the sensitivity to the neutrino mass hierarchy and other neutrino parameters. I will review how this happens, and how this effect can be exploited using atmospheric neutrinos in future detectors, comparing the advantages and sensitivities that can be obtained in different kinds of detectors  a magnetized iron detector, a water Cerenkov detector and a Liquid Argon detector. 
Oct 14 2009
16:30 
SISSA, Room D

Bobby Acharya
(ICTP)

The Nonthermal WIMP Miracle and the LHC 
ABSTRACT: 
May 06 2009
16:30 
SISSA, Room D

Damiano Anselmi
(Uiversità di Pisa)

Standard Model and High Energy Lorentz Violation 
ABSTRACT: 
Mar 18 2009
16:30 
SISSA, Room D

David Tong
(DAMTP, Cambridge, UK)

Berry Phase and Supersymmetry 
ABSTRACT: 
Mar 04 2009
16:30 
SISSA, Room D

Minoru Eto
(University of Pisa)

Multiple layer structures of nonAbelian vortex and interactions 
ABSTRACT: 
Feb 18 2009
16:30 
SISSA, Room D

Claudia Hagedorn
(SISSA)

Fermion Mixings from Discrete Symmetries: The Cabibbo Angle from the Dihedral Group D_{14} 
ABSTRACT: Flavor symmetries, especially if they are broken in a particular way, seem to be the prime candidate for predicting the fermion mass and mixing patterns correctly. In this talk we present a supersymmetric model with the flavor symmetry D_{14} in which the CKM
matrix element V_{ud} can take the value V_{ud} =cos ( pi/14 ) =
0.97493. This value is very close to the one observed in experiments.
The value of V_{ud} is based on the fact that different Z_{2} subgroups of D_{14} are conserved in the up and down quark sector. The quark mass hierarchy is partly due to the flavor group D_{14} and partly due to a FroggattNielsen symmetry U(1)_{FN}. The model is
completely natural in the sense that the hierarchies among the quark
masses and mixing angles are generated with the help of symmetries.
The vacuum alignment of the flavor symmetry breaking fields is
discussed as well as corrections stemming from the Z_{2} breaking
in the up and down quark sector. 