Astroparticle Coffee History
| Date |
Room |
Speaker |
Title |
Dec 16 2016
11:00 |
Euler Lecture Hall, ICTP
|
Matteo Viel
()
|
Using the Lyman-alpha forest to address the nature of dark matter |
ABSTRACT: I will discuss recent results in the field of intergalactic medium cosmology and how small scale properties of the transmitted flux can constrain the dark matter properties. |
Dec 02 2016
11:00 |
SISSA, Big meeting room
|
Jin U Kang
()
|
TBA |
ABSTRACT: TBA |
Nov 25 2016
11:00 |
SISSA, Big meeting room
|
Matt Visser
(Victoria University of Wellington)
|
Twisted black holes are unphysical |
ABSTRACT: Twisted black holes were proposed by Zhang (1609.09721 [gr-qc]), and studied by Chen and Jing (1610.00886 [gr-qc]), and by Ong (1610.05757 [gr-qc]). These spacetimes are certainly Ricci-flat, but are merely minor variants on Taub--NUT spacetime. They exhibit several unphysical features that make them quite unreasonable as realistic astrophysical objects. Twisted black holes are not (globally) asymptotically flat. They contain closed timelike curves that are not hidden behind any event horizon --- the most obvious of these closed timelike curves are small azimuthal circles around the rotation axis, but the effect is more general. The entire region outside the horizon is infested with closed timelike curves.
(I will discuss how it is easy to see that there is something very unusual about these twisted black holes; and then give elementary arguments for the pathology. I will also discuss how fast things can now change due to existence of the arXiv — see arXiv:1610.06135 [gr-qc].) |
Nov 18 2016
11:00 |
Euler Lecture Hall ICTP
|
Francesca Lepori
(SISSA)
|
A model independent method for the Alcock-Paczynski test |
ABSTRACT: The Alcock-Paczynski (AP) test is a purely geometric test of the cosmic expansion. It consists of measuring the ratio between the radial and transverse size of an intrinsically isotropic object. A suitable target for the AP test is the Baryon Acoustic Oscillations (BAO) feature in the galaxy 2-point correlation function. After giving a brief introduction to the implication of BAO measurements for cosmology, I will discuss a method for the AP test applied to the BAO peak, which does not require any prior assumption on the cosmological parameters. I will show how this method is affected by redshift space distortions, gravitational lensing, galaxy bias and the projection effect introduced by a radial window function. (Based on https://arxiv.org/abs/1606.03114) |
Nov 04 2016
11:00 |
SISSA, Big meeting room
|
Dionigi Benincasa
(SISSA)
|
Computing Entanglement Entropy from Correlation Functions |
ABSTRACT: After giving a brief introduction to the notion of entanglement entropy, I will discuss a recent result due to R. Sorkin that allows one to compute entanglement entropy of a quantum field directly from correlation functions. Unlike the von Neumann formula where an entropy is assigned to density matrices living on a Cauchy surface, C, this formula assigns an entropy to spacetime regions, R. The two entropies coincide when R is globally hyperbolic with Cauchy surface C. If time permits I will then discuss a peculiar property of Sorkin’s entropy applied to quantum fields living on discrete Lorentz invariant spacetimes, where the notion of state at a moment of time does not exist. |
Oct 21 2016
11:00 |
ICTP, Euler Lecture Hall
|
Leonardo Trombetta
()
|
DE from non local effective actions of gravity |
ABSTRACT: In this journal club I will talk about some attempts to describe dark energy with non local effective actions for the (classical) metric. These kind of modifications generically arise when integrating out quantum fields in curved spaces. Loosely based on [arXiv:1606.08784], I will first give a brief introduction and motivation, and then discuss some models in FRW spacetimes, some of which have an interesting phenomenology. |
Sep 23 2016
10:00 |
Euler Lecture Hall ICTP
|
Andrei Khmelnitsky
()
|
Relaxing the cosmological constant |
ABSTRACT: We propose a technically natural scenario whereby an initially large cosmological constant (c.c.) is relaxed down to the observed value due to the dynamics of a scalar evolving on a very shallow potential. The model crucially relies on a sector that violates the null energy condition (NEC) and gets activated only when the Hubble rate becomes sufficiently small --- of the order of the present one. As a result of NEC violation, this low-energy universe evolves into inflation, followed by reheating and the standard Big Bang cosmology. The symmetries of the theory force the c.c. to be the same before and after the NEC-violating phase, so that a late-time observer sees an effective c.c. of the correct magnitude. Importantly, our model allows neither for eternal inflation nor for a set of possible values of dark energy, the latter fixed by the parameters of the theory. |
Jul 22 2016
11:00 |
ICTP - Euler Lecture hall
|
Paolo Creminelli
(ICTP)
|
joint SISSA/ICTP APP-cosm JC |
ABSTRACT: paper to be discussed: https://arxiv.org/abs/1602.03520 |
Jul 08 2016
11:00 |
Big meeting room - SISSA
|
Thomas Jacques
(SISSA)
|
Simplified models vs EFTs for DM searches at the LHC (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: EFTs and, more recently, simplified models have become a popular way to constrain dark matter at the LHC in a way designed to be as model-agnostic as possible. I will discuss the construction and usage of these models, the theoretical problems with these techniques, and some ways to fix them. |
Jun 24 2016
11:00 |
ICTP - Euler Lecture hall
|
Pietro Baratella
(SISSA)
|
TBA (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: TBA |
Jun 10 2016
11:00 |
Big meeting room - SISSA
|
Costantino Pacilio, Vedran Skrinjar
(SISSA)
|
TBA (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: TBA |
May 27 2016
11:00 |
ICTP - Euler Lecture hall
|
Andr Benevides, Lorenzo Bordin
()
|
TBA (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: TBA |
May 20 2016
11:00 |
Big meeting room - SISSA
|
Mauro Valli
(SISSA)
|
TBA (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: TBA |
Apr 29 2016
11:00 |
ICTP - Euler Lecture hall
|
Paolo Creminelli
(ICTP)
|
TBA (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: TBA |
Apr 15 2016
11:00 |
Big meeting room - SISSA
|
Ernesto Lopez Fune
(SISSA)
|
TBA (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: TBA |
Apr 08 2016
11:00 |
Big meeting room - SISSA
|
Mauro Valli
(SISSA)
|
TBA (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: TBA |
Apr 01 2016
11:00 |
ICTP - Euler Lecture hall
|
André Benevides, Lorenzo Bordin
(SISSA)
|
TBA (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: TBA |
Mar 04 2016
11:00 |
ICTP - Euler Lecture hall
|
Emiliano Sefusatti
()
|
TBA (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: TBA |
Feb 19 2016
11:00 |
Big meeting room - SISSA
|
Alejandro Castedo
(SISSA)
|
TBA (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: TBA |
Feb 05 2016
11:00 |
ICTP - Euler Lecture hall
|
Vid Irsic
(ICTP)
|
Lyman alpha forest: from small to large scales (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: The last decade has witnessed an enormous progress in the cosmological\r\ninvestigation of the intergalactic medium (IGM) as probed by the\r\nLyman-alpha forest. In my talk I will review the current status of the\r\nfield and give a brief historical overview of how the cosmological focus\r\nof the field has evolved form studying small scales to large scales. I\r\nwill conclude by presenting calculations of the Lyman-alpha flux\r\nfluctuations with full relativistic corrections (to first order), and its\r\napplication to the cross-correlation functions. |
Jan 22 2016
11:00 |
Big meeting room - SISSA
|
Marco Letizia
(SISSA)
|
Lorentz violation in gravity: the case of Einstein-Aether theory (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: After introducing Einstein-Aether theory as a framework to incorporate Lorentz violation in gravity, I will discuss its relation to Horava-Lifshitz gravity and some of the consequences of introducing a preferred frame in the context of single field inflation. |
Jan 15 2016
11:00 |
ICTP - Euler Lecture hall
|
Jin U Kang
()
|
Effective dynamics of cosmological fields in a thermal background (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: |
Dec 11 2015
11:00 |
Big meeting room
|
Teresa Bautista Solans
(ICTP)
|
Weyl Anomalies and Quantum Cosmology (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: I will talk about the cosmological consequences of Weyl anomalies arising from the renormalization of composite operators in a theory of gravity with a cosmological constant. Near two dimensions, the relevant anomaly can be computed explicitly using results from Liouville theory and leads to a non-local quantum effective action. The resulting quantum energy momentum tensor is non-local and leads to a decaying vacuum energy in a homogeneous and isotropic expanding universe.
I will discuss a generalization of these results to four dimensions and possible implications for inflation, the cosmological constant problem, and de Sitter spacetime. |
Nov 27 2015
11:00 |
ICTP - Euler Lecture hall
|
Takeshi Kobayashi
(SISSA)
|
Constraints on Primordial Magnetic Fields from Inflation (joint SISSA/ICTP APP-cosm JC) |
ABSTRACT: After introducing observational hints for the existence of cosmological-scale magnetic fields, I will discuss how the inflationary epoch can magnetize our universe, and also discuss general constraints on primordial magnetic fields from inflation. |
Feb 04 2015
14:00 |
Room 005
|
Alessio Belenchia
(SISSA)
|
Analogue gravity: kinematical and dynamical analogues |
ABSTRACT: I will do a short review of some analogue gravity model, from classical to quantum systems. The focus will be both on systems that present kinematical features analogue to quantum field theory in curved spacetime, and systems that share dynamical features analogous to gravity theories. The former being relevant for understanding key features of effects such as Hawking radiation and the latter as toy models for the emergent spacetime paradigm.http://www.sissa.it/app/images/ok-icon.png |
Sep 11 2014
14:00 |
room 005
|
Kirill Krasnov
(University of Nottingham)
|
Gravity as a Gauge Theory |
ABSTRACT: I will describe how geometry and its dynamics can be described using an SU(2) gauge field instead of the metric. This works in 4 spacetime dimensions and is based on the self-duality. One of the advantages of this new gauge-theoretic formalism is that the (linearised) description of gravitons is much simpler than in the metric language. This simplicity relies on a certain complex of differential operators. |
Jul 02 2014
12:00 |
room 128
|
Alessandro Lovato
(Physics Division, Argonne National Laboratory)
|
Electroweak response functions: from Carbon-12 to Neutron Matter |
ABSTRACT: I will report on an ab initio calculation of the Carbon-12 chargernform factor and sum rules of electromagnetic and neutral-current responsernfunctions. The longitudinal elastic form factor and the electromagnetic sumrnrules are found to be in satisfactory agreement with available experimentalrndata. The transverse electromagnetic and neutral current sum rules receivernlarge contributions from the two-body currents. In the Electromagnetic casernthey are needed for a better agreement with experimental data; this factrnmay have implications for the anomaly observed in recent neutrinornquasi-elastic charge-changing scattering data off Carbon-12.rnThe role played by nuclear correlations is discussed in both Carbon-12 andrnneutron matter case. In particular, I will show how the neutrino mean freernpath in cold neutron matter turns out to be strongly affected by both shortrnand long range correlations, leading to a sizable increase with respect tornthe prediction of the Fermi gas model.rnPreliminary results on the neutral current euclidean response function ofrnCarbon-12 will also be shown. |
May 07 2014
14:00 |
|
Jacobo López Pavón
(SISSA)
|
Low-scale minimal seesaw models vs Neff |
ABSTRACT: I will start discussing why and how the Standard Model (SM) has to be extended in\r\norder to accommodate neutrino masses, introducing at the same time the most popular models regarding this issue. After that I will focus on the Type-I seesaw models, which are the most simple extensions of the SM that can explain neutrino masses. In this models, the SM field content is minimally extended with fermion singlets (sterile neutrinos) and a New Physics scale, M, associated to their physical masses is introduced. This scale is introduced to account for neutrino masses and usually assumed to be much larger than the electroweak scale. However, these models can explain neutrino masses for any value of M above $O(eV)$ up to $O(10^{15} GeV)$. The seesaw scale is presently unconstrained and its determination is one of the most important questions in neutrino physics. Paying special attention to the contribution of the sterile states to $N_{eff}$ as a function of M, I will show that a large part\r\n(8 orders of magnitude) can be excluded thanks to cosmological measurements. |
Apr 16 2014
14:00 |
|
Eolo Di Casola
(SISSA)
|
The Enchanting Carousel: A bird's eye view of Gödel's universe |
ABSTRACT: We shall give a glance at few key aspects of Gödel's solution of Einstein's equations (structure of the spacetime, relations with other relevant cosmological models, interpretation, pitfalls), possibly discussing its emergence in the context of extended theories of gravity. |
Apr 09 2014
14:00 |
|
Maria Archidiacono
(Aarhus University)
|
Neutrinos and the interplay between cosmology and particle physics |
ABSTRACT: In the last few years the imprint of light sterile neutrinos on cosmological data sets has been deeply investigated within the framework of different theoretical scenarios. Nevertheless the question whether cosmology can accommodate the existence of additional neutrinos is still open. The strong dependence of the results on the underlined cosmological model and on the included data sets contributes to a puzzling scenario. Recently the discovery of B-modes in the polarization of the Cosmic Microwave Background has reopened the debate, providing new life to light sterile neutrinos and their unique imprinting on CMB as a dark radiation component. I will review the status of the cosmological constraints on light sterile neutrinos, focussing the discussion on the consistency with neutrino oscillation experiments. |
Feb 12 2014
14:00 |
SISSA, Room 005
|
Marko Simonović
(SISSA)
|
Consistency Relations for Cosmological Perturbations - from Inflation to Galaxies |
ABSTRACT: |
Jan 28 2014
14:00 |
SISSA, Room 005
|
Matteo Martinelli
(SISSA)
|
Dark Energy: an overview |
ABSTRACT: |
Dec 17 2013
14:00 |
SISSA, Room 005
|
Dionigi Benincasa
(SISSA)
|
Causal Set Quantum Gravity: an overview |
ABSTRACT: |
Nov 27 2013
13:30 |
TBA
|
Piero Ullio
(SISSA)
|
Recent developments in direct Dark Matter search |
ABSTRACT: |
Jun 07 2013
9:30 |
Euler Room, ICTP
|
Dario Bettoni
(SISSA)
|
Probing Dark Energy through Scale Dependence, Observables and unobservables in dark energy cosmologies |
ABSTRACT: |
May 08 2013
13:30 |
Room 005
|
Michele Lucente
(SISSA)
|
Sterile Neutrino Oscillations: The Global Picture |
ABSTRACT: Neutrino oscillations involving eV-scale neutrino mass states are investigated in the context of global neutrino oscillation data including short and long-baseline accelerator, reactor, and radioactive source experiments, as well as atmospheric and solar neutrinos. We consider sterile neutrino mass schemes involving one or two mass-squared differences at the eV^2 scale denoted by 3+1, 3+2, and 1+3+1. We discuss the hints for eV-scale neutrinos from nu_e disappearance (reactor and Gallium anomalies) and nu_mu->nu_e appearance (LSND and MiniBooNE) searches, and we present constraints on sterile neutrino mixing from nu_mu and neutral-current disappearance data. An explanation of all hints in terms of oscillations suffers from severe tension between appearance and disappearance data. The best compatibility is obtained in the 1+3+1 scheme with a p-value of 0.2% and exceedingly worse compatibilities in the 3+1 and 3+2 schemes. |
Apr 12 2013
9:00 |
ICTP
|
Paolo Creminelli
(ICTP)
|
Entanglement entropy in de Sitter space |
ABSTRACT: We compute the entanglement entropy for some quantum field theories on de Sitter space. We consider a superhorizon size spherical surface that divides the spatial slice into two regions, with the field theory in the standard vacuum state. First, we study a free massive scalar field. Then, we consider a strongly coupled field theory with a gravity dual, computing the entanglement using the gravity solution. In even dimensions, the interesting piece of the entanglement entropy is proportional to the number of e-foldings that elapsed since the spherical region was inside the horizon. In odd dimensions it is contained in a certain finite piece. In both cases the entanglement captures the long range correlations produced by the expansion. |
Apr 12 2013
10:30 |
ICTP
|
Emiliano Sefusatti
(ICTP)
|
Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity |
ABSTRACT: The Planck nominal mission cosmic microwave background (CMB) maps yield\r\nunprecedented constraints on primordial non-Gaussianity (NG). Using three\r\noptimal bispectrum estimators, separable template-fitting (KSW), binned, and\r\nmodal, we obtain consistent values for the primordial local, equilateral, and\r\northogonal bispectrum amplitudes, quoting as our final result f_NL^local=2.7\r\n+/- 5.8, f_NL^equil= -42 +/- 75, and f_NL^ortho= -25 +/- 39 (68% CL\r\nstatistical); and we find the Integrated-Sachs-Wolfe-lensing bispectrum\r\nexpected in the LambdaCDM scenario. The results are based on comprehensive\r\ncross-validation of these estimators on Gaussian and non-Gaussian simulations,\r\nare stable across component separation techniques, pass an extensive suite of\r\ntests, and are confirmed by skew-C_l, wavelet bispectrum and Minkowski\r\nfunctional estimators. Beyond estimates of individual shape amplitudes, we\r\npresent model-independent, three-dimensional reconstructions of the Planck CMB\r\nbispectrum and thus derive constraints on early-Universe scenarios that\r\ngenerate primordial NG, including general single-field models of inflation,\r\nexcited initial states (non-Bunch-Davies vacua), and directionally-dependent\r\nvector models. We provide an initial survey of scale-dependent feature and\r\nresonance models. These results bound both general single-field and multi-field\r\nmodel parameter ranges, such as the speed of sound, c_s geq 0.02 (95% CL), in\r\nan effective field theory parametrization, and the curvaton decay fraction r_D\r\ngeq 0.15 (95% CL). The Planck data put severe pressure on ekpyrotic/cyclic\r\nscenarios. The amplitude of the four-point function in the local model tau_NL<\r\n2800 (95% CL). Taken together, these constraints represent the highest\r\nprecision tests to date of physical mechanisms for the origin of cosmic\r\nstructure. |
Mar 20 2013
13:30 |
7th floor big meeting room - SISSA
|
Bethan Cropp
(SISSA)
|
From configuration to dynamics -- Emergence of Lorentz signature in classical field theory |
ABSTRACT: The Lorentzian metric structure used in any field theory allows one to implement the relativistic notion of causality and to define a notion of time dimension. This article investigates the possibility that at the microscopic level the metric is Riemannian, i.e. locally Euclidean, and that the Lorentzian structure, that we usually consider as fundamental, is in fact an effective property that emerges in some regions of a 4-dimensional space with a positive definite metric. In such a model, there is no dynamics nor signature flip across some hypersurface; instead, all the fields develop a Lorentzian dynamics in these regions because they propagate in an effective metric. It is shown that one can construct a decent classical field theory for scalars, vectors and (Dirac) spinors in flat spacetime. It is then shown that gravity can be included but that the theory for the effective Lorentzian metric is not general relativity but of the covariant Galileon type. The constraints arising from stability, the equivalence principle and the constancy of fundamental constants are detailed and a phenomenological picture of the emergence of the Lorentzian metric is also given. The construction, while restricted to classical fields in this article, offers a new view on the notion of time. |
Feb 27 2013
13:30 |
SISSA - Room 137
|
Giulio D'Odorico
(SISSA)
|
Black holes and entanglement entropy |
ABSTRACT: I will give an overview of some recent papers (1302.1878, 1212.6824) discussing the renormalization of entanglement entropy, the relation with its thermodynamical counterpart for black hole spacetimes, and the possible insights given by the renormalization group. If I have time, I will also briefly review what has been found recently (1212.1821) in the context of asymptotically safe gravity. |
Feb 15 2013
9:30 |
Euler Room, ICTP
|
Emanuele Castorina
(SISSA)
|
Statistical ensembles of virialized halo matter density profiles |
ABSTRACT: We define and study statistical ensembles of matter density profiles describing spherically symmetric, virialized dark matter haloes of finite extent with a given mass and total gravitational potential energy. We provide an exact solution for the grand canonical partition functional, and show its equivalence to that of the microcanonical ensemble. We obtain analytically the mean profiles that correspond to an overwhelming majority of micro-states. All such profiles have an infinitely deep potential well, with the singular isothermal sphere arising in the infinite temperature limit. Systems with virial radius larger than gravitational radius exhibit a localization of a finite fraction of the energy in the very center. The universal logarithmic inner slope of unity of the NFW haloes is predicted at any mass and energy if an upper bound is set to the maximal depth of the potential well. In this case, the statistically favored mean profiles compare well to the NFW profiles. For very massive haloes the agreement becomes exact. |
Feb 08 2013
10:00 |
Room 005
|
Federico Urban
(Universite' Libre de Bruxelles)
|
Cosmic Rays with Telescope Array |
ABSTRACT: I will review the current state of art in the cosmic rays business and the latest results from Telescope Array from a newcomer point of view. |
Jan 30 2013
13:30 |
VII floor meeting room (SISSA)
|
Gabriele Trevisan
(SISSA)
|
Anomalous Dimensions and Non-Gaussianity |
ABSTRACT: We analyze the signatures of inflationary models that are coupled to strongly interacting field theories, a basic class of multifield models also motivated by their role in providing dynamically small scales. Near the squeezed limit of the bispectrum, we find a simple scaling behavior determined by operator dimensions, which are constrained by the appropriate unitarity bounds. Specifically, we analyze two simple and calculable classes of examples: conformal field theories (CFTs), and large-N CFTs deformed by relevant time-dependent double-trace operators. Together these two classes of examples exhibit a wide range of scalings and shapes of the bispectrum, including nearly equilateral, orthogonal and local non-Gaussianity in different regimes. Along the way, we compare and contrast the shape and amplitude with previous results on weakly coupled fields coupled to inflation. This signature provides a precision test for strongly coupled sectors coupled to inflation via irrelevant operators suppressed by a high mass scale up to 1000 times the inflationary Hubble scale. [Ref. |
Jan 18 2013
9:30 |
ICTP
|
Neil Barnaby
(University of Cambridge, DAMTP)
|
New Sources of Cosmological Fluctuations from Inflation |
ABSTRACT: Primordialrngravitational waves are key observable relics of the early universe,rnand might be detected in the near future via the B-mode polarization ofrnthe CMB. Gravitational waves are inevitably generated during inflationrnas quantum fluctuations of the metric; their detection would constitute arnmeasurement of the fundamental energy scale of inflation. In this talk Irnwill discuss the possibility that additional model-dependent sources ofrngravitational waves could provide a competative signal, weakening thernlink between the B-mode polarization and the scale of inflation. I willrnshow that simple particle production models do not source an importantrncontribution to the gravitational wave spectrum on CMB scales, butrnfeatures and non-Gaussianity in the scalar sector might be detectable. |
Dec 12 2012
13:30 |
Room 137
|
Marko Simonovic
(SISSA)
|
Stochastic Bias from Non-Gaussian Initial Conditions |
ABSTRACT: In this talk I will discuss recently proposed stochastic scale-dependent bias as a probe for primordial non-Gaussianities for a particular class of inflationary models. I will show how a stochastic form of scale-dependent halo bias can arise in multi-source inflationary models, where multiple fields determine the initial curvature perturbation. After a brief derivation of the effect for general non-Gaussian initial conditions, I will focus on some examples where this effect can be large. The study of a collapsed limit of the four point function is of a particular interest since, at lowest order, this is the regime in which the stochasticity arises if the collapsed limit is boosted relative to the square of the three-point function in the squeezed limit.[ |
Nov 30 2012
9:30 |
Luigi Stasi Room - ICTP
|
David Marzocca
(SISSA)
|
Higgs mass and vacuum stability in the Standard Model |
ABSTRACT: I will review the paper 1205.6497, where the authors present the\r\n state-of-the-art computation of the Higgs potential in the Standard\r\n Model and discuss its stability in the light of the recent\r\n measurement of the Higgs mass at about 126GeV. I will then discuss\r\n some implications and possible applications of this work in the\r\n context of Higgs inflation, supersymmetry and neutrino physics. |
Nov 30 2012
10:15 |
Luigi Stasi Room - ICTP
|
Emiliano Sefusatti
(ICTP)
|
The BOSS Lyman-alpha Forest Sample from SDSS Data Release 9. |
ABSTRACT: We present the BOSS Lyman-alpha (Lya) Forest Sample from SDSS Data Release 9, comprising 54,468 quasar spectra with zqso > 2.15 suitable for Lya forest analysis. This data set probes the intergalactic medium with absorption redshifts 2.0 < z_alpha < 5.7 over an area of 3275 square degrees, and encompasses an approximate comoving volume of 20 h^-3 Gpc^3. With each spectrum, we have included several products designed to aid in Lya forest analysis: improved sky masks that flag pixels where data may be unreliable, corrections for known biases in the pipeline estimated noise, masks for the cores of damped Lya systems and corrections for their wings, and estimates of the unabsorbed continua so that the observed flux can be converted to a fractional transmission. The continua are derived using a principal component fit to the quasar spectrum redwards of restframe Lya (lambda > 1216 Ang), extrapolated into the forest region and normalized by a linear function to fit the expected evolution of the Lya forest mean-flux. The estimated continuum errors are ~5% rms. We also discuss possible systematics arising from uncertain spectrophotometry and artifacts in the flux calibration; global corrections for the latter are provided. Our sample provides a convenient starting point for users to analyze clustering in BOSS Lya forest data, and it provides a fiducial data set that can be used to compare results from different analyses of baryon acoustic oscillations in the Lya forest. The full data set is available from the SDSS-III DR9 web site. |
Nov 07 2012
13:30 |
Big Meeting Room VII floor
|
Daniele Gaggero
(SISSA)
|
Cosmic rays propagation in the galaxy |
ABSTRACT: I will give a brief overview on the propagation of Cosmic Rays (CR) in the turbulent magnetic field of the Galaxy.\r\nFirst, I will present in detail the diffusion-loss equation describing the process and I will describe DRAGON, the recently developed numerical code that solves this equation for all CR species under very general assumptions.\r\nThen, I\'ll discuss some relevant results obtained with the code with particular focus on: 1) the maximum likelihood analysis we performed to constrain the free parameters involved in the problem and the best model we found, which is compatible with most CR observables; 2) the solution we proposed to a couple of long-standing puzzles in CR physics, i.e. the gradient problem and the anisotropy problem.\r\nIn the last part of the talk I will briefly present some interesting recent results on leptonic species, in particular the positron excess measured by both PAMELA and Fermi-LAT, and the anisotropy upper limits released by Fermi-LAT, with a small discussion on the future projects (and future updates of the code) related to these topics. |
Oct 24 2012
13:30 |
7th floor Big meeting room
|
Shuang-Yong Zhou
(SISSA)
|
Aspects of Galileon Field Theory |
ABSTRACT: The Galileon model was inspired by the braneworld DGP model and was originally proposed as infrared modifications to General Relativity. Various extensions have been investigated, both from a phenomenological and field theoretical point of view. I will try to give a broader picture while focusing on my work on this area. |
Jun 06 2012
13:00 |
Big Meeting Room
|
Carlo Pagani
(SISSA)
|
f(R) Gravity from the renormalisation group |
ABSTRACT: We explore the cosmological dynamics of an effective f(R) model rnconstructed from a renormalisation group (RG) improvement of the Einstein--Hilbert action, using the non-perturbative beta functions of the exact renormalisation group equation. The resulting f(R) model has some remarkable properties. It naturally exhibits an unstable de Sitter era in the ultraviolet (UV), dynamically connected to a stable de Sitter era in the IR, via a period of radiation and matter rndomination, thereby describing a non-singular universe. We find that the UV de Sitter point is one of an infinite set, which make the UV RG fixed point inaccessible to classical cosmological evolution. In the vicinity of the fixed point, the model behaves as R^2 gravity, while it correctly recovers General Relativity at solar system scales. In this simplified model, the fluctuations are too large to be the observed ones, and more ingredients in the action are needed. |
May 30 2012
13:00 |
Room 135
|
Aseem Paranjape
(ICTP)
|
Bayesian physical reconstruction of initial conditions from large
scale structure surveys |
ABSTRACT: We present a fully probabilistic, physical model of the non-linearly evolved density field, as probed by realistic galaxy surveys. Our model is valid in the linear and mildly non-linear regimes and uses second order Lagrangian perturbation theory to connect the initial conditions with the final density field. Our parameter space consists of the 3D initial density field and our method allows a fully Bayesian exploration of the sets of initial conditions that are consistent with the galaxy distribution sampling the final density field. Our method naturally and accurately reconstructs non-linear features corresponding to three-point and higher order correlation functions such as walls and filaments. Simple tests of the reconstructed initial conditions show statistical consistency with the Gaussian simulation inputs. Our test demonstrates that statistical approaches based on physical models of the large scale structure distribution are now becoming feasible for realistic current and future surveys. arXiv1203.3639 |
May 16 2012
13:00 |
7th floor Big Meeting Room
|
Yabebal Fantaye
(SISSA)
|
A measurement of gravitational lensing of the microwave background using South Pole Telescope data |
ABSTRACT: We use South Pole Telescope data from 2008 and 2009 to detect the
non-Gaussian signature in the cosmic microwave background (CMB)
produced by gravitational lensing and to measure the power spectrum of
the projected gravitational potential. We constrain the ratio of the
measured amplitude of the lensing signal to that expected in a
fiducial LCDM cosmological model to be 0.86 +/- 0.16, with no lensing
disfavored at 6.3 sigma. Marginalizing over LCDM cosmological models
allowed by the WMAP7 results in a measurement of A_lens=0.90+/-0.19,
indicating that the amplitude of matter fluctuations over the redshift
range 0.5 <~ z <~ 5 probed by CMB lensing is in good agreement with
predictions. We present the results of several consistency checks.
These include a clear detection of the lensing signature in CMB maps
filtered to have no overlap in Fourier space, as well as a "curl"
diagnostic that is consistent with the signal expected for LCDM. We
perform a detailed study of bias in the measurement due to noise,
foregrounds, and other effects and determine that these contributions
are relatively small compared to the statistical uncertainty in the
measurement. We combine this lensing measurement with results from
WMAP7 to improve constraints on cosmological parameters when compared
to those from WMAP7 alone: we find a factor of 3.9 improvement in the
measurement of the spatial curvature of the Universe,
Omega_k=-0.0014+/-0.0172; a 10% improvement in the amplitude of matter
fluctuations within LCDM, sigma_8=0.810+/ 0.026; and a 5% improvement
in the dark energy equation of state, w=-1.04+/-0.40. When compared
with the measurement of w provided by the combination of WMAP7 and
external constraints on the Hubble parameter, the addition of the
lensing data improve the measurement of w by 15% to give
w=-1.087+/-0.096.
arxiv:1202.0546 |
Apr 18 2012
13:00 |
7th floor Big Meeting Room
|
Emiliano Sefusatti
(ICTP)
|
The BOSS papers |
ABSTRACT: The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: measurements of the growth of structure and expansion rate at z=0.57 from anisotropic clustering arXiv:1203.6641,
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological implications of the large-scale two-point correlation function
arXiv:1203.6616
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: a large sample of mock galaxy catalogues arXiv:1203.6609
The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 9 Spectroscopic Galaxy Sample
arXiv:1203.6594
|
Mar 28 2012
13:00 |
room 005
|
Gabrijela Zaharijas
(ICTP)
|
Fermi Bubbles in the Milky Way: the closest AGN feedback
laboratory courtesy of Sgr A*? |
ABSTRACT: Deposition of a massive ($10^4$ to $10^5 \msun$) giant molecular cloud (GMC) into the inner parsec of the Galaxy is widely believed to explain the origin of over a hundred unusually massive young stars born there $\sim 6$ Myr ago. An unknown fraction of that gas could have been accreted by Sgr A*, the supermassive black hole (SMBH) of the Milky Way. It has been recently suggested that two observed $\gamma$-ray-emitting bubbles emanating from the very center of our Galaxy were inflated by this putative activity of Sgr A*. We run a suite of numerical simulations to test whether the observed morphology of the bubbles could be due to the collimation of a wide angle outflow
from Sgr A* by the disc-like Central Molecular Zone (CMZ), a well known massive repository of molecular gas in the central $\sim 200$ pc. We find that an Eddington-limited outburst of Sgr A* lasting $\simeq 1$ Myr is required to reproduce the morphology of the {\it Fermi} bubbles, suggesting that the GMC mass was $\sim 10^5 \msun$ and it was mainly accreted by Sgr A* rather than used to make stars. We also find that the outflow from Sgr A* enforces strong angular momentum mixing in the CMZ disc, robustly sculpting it into a much
narrower structure -- a ring -- perhaps synonymous with the recently reported "Herschel ring". In addition, we find that Sgr A* outflow is likely to have induced formation of massive star-forming GMCs in the CMZ. In this scenario, the Arches and Quintuplet clusters, the two observed young star clusters in the central tens of parsecs of the Galaxy, and also GMCs such as Sgr B2, owe their existence to the recent Sgr A* activity., arXiv:1203.3060 |
Mar 21 2012
13:00 |
Room 005
|
Dario Bettoni
(SISSA)
|
Cleaning up the cosmological constant |
ABSTRACT: We present a novel idea for screening the vacuum energy contribution to the overall value of the cosmological constant, thereby enabling us to choose the bare value of the vacuum curvature empirically, without any need to worry about the zero-point energy contributions of each particle. The trick is to couple matter to a metric that is really a composite of other fields, with the property that the square-root of its determinant is the integrand of a topological invariant, and/or a total derivative. This ensures that the vacuum energy contribution to the Lagrangian is non-dynamical. We then give an explicit example of a theory with this property that is free from Ostrogradski ghosts, and is consistent with solar system physics and cosmological tests. arXiv:1203.1040v1 |
Feb 29 2012
13:00 |
7th floor Big Meeting Room
|
Matteo Martinelli
(SISSA)
|
Constraining Modified Gravity and Coupled Dark Energy with
Future Observations |
ABSTRACT: Satellite missions as the on-going Planck experiment and the proposed
weak lensing Euclid survey are expected to provide the strongest
constraints on a wide set of cosmological parameters.
These missions can offer the opportunity either to test general
relativity on cosmic scales through mapping of the galaxy weak lensing
signal either to test possible couplings between dark energy and dark
matter. In this talk I will discuss the ability of these experiments
to constrain modified gravity scenarios, in particular those predicted
by f(R) theories, and coupled dark energy.
I will show that Euclid will improve constraints expected from the PLANCK
satellite on these models by several orders of magnitude.
I will also discuss parameter degeneracies and the possible
biases introduced by these modifications to the standard picture. |
Feb 22 2012
13:00 |
7th floor Big Meeting Room
|
Andrzej Hryczuk
(SISSA)
|
Asymmetric Higgsino Dark Matter |
ABSTRACT: In the supersymmetric framework, a higgsino asymmetry exists in the universe before the electroweak phase transition. We investigate whether the higgsino is a viable asymmetric dark matter candidate. We find that this is indeed possible. The gauginos, squarks and sleptons must all be very heavy, such that the only electroweak-scale superpartners are the higgsinos. The temperature of the electroweak phase transition must be in the (1-10) GeV range. arXiv1201.2699 |
Feb 08 2012
13:00 |
7th Floor Big Meeting Room
|
Giorgio Arcadi
(SISSA)
|
A WIMPy Baryogenesis miracle |
ABSTRACT: Y. Cui, L. Randall, B. Shuve: arxiv.1112.2704"Generally, baryogenesis and the establishment of the dark matter density are treated as independent processes. Recent work on asymmetric dark matter shows that connections between the dark and visible sectors might account for the similarity in the energy densities of baryonic and dark matter. In this paper, we explore a
very different possible connection, in which weakly interacting massive particle (WIMP) dark matter annihilation is also directly responsible for baryogenesis. We call this process "WIMPy baryogenesis". The dark matter relic density in these models, as with
conventional WIMP models, is obtained with only order one couplings and TeV-scale masses according to the WIMP miracle. Thus, WIMPy baryogenesis models naturally accommodate weak-scale dark matter, in contrast with many asymmetric dark matter models. Furthermore, in WIMPy baryogenesis the observed baryon asymmetry is simultaneously obtained together with the correct dark matter abundance, which is the "miracle" of WIMPy baryogenesis. The models we present have the further feature that they create the baryon number asymmetry at the weak scale, thereby avoiding the problems in some models of
baryogenesis associated with high reheat temperatures in supersymmetric theories. Some of these models yield observable
consequences in ongoing and future experiments." |
Jan 25 2012
13:00 |
7th Floor Large Meeting Room
|
Alioscia Hamma
(Perimeter Institute)
|
The fast scrambling conjecture |
ABSTRACT: In this talk, I will discuss the recent paper arxiv:1111.6580, where the authors propose that Black Holes are fast scramblers. A fast scrambler is a quantum device that is able to totally mix the reduced system of a pure quantum state in the shortest possible time. This property is connected -as we also discuss in the other talk- to a strong form of thermalization. It is conjectured that Black Holes are the fastest scrambles in nature, namely they can scramble quantum information in a time that scales logarithmically with the system size.
|
Jan 18 2012
13:00 |
7th Floor Large Meeting Room
|
Maryam Tavakoli
(SISSA)
|
"Fermi-LAT constraints on dark matter annihilationcross section with the Fornax cluster" and "Evidence for extended gamma-ray emission from galaxy cluster" |
ABSTRACT: Shin'ichiro Ando and Daisuke Nagai, arXiv.1201.0753
Jiaxin Han, Carlos S. Frenk, Vincent R. Eke, Liang Gao, Simon
D. M. White, arXiv.1201.1003 |
Jan 11 2012
13:00 |
7th Floor Large Meeting Room
|
Eolo di Casola
(SISSA)
|
Lorentz violating kinematics: Threshold theorems |
ABSTRACT: Recent tentative experimental indications, and the subsequent theoretical speculations, regarding possible violations of Lorentz invariance have attracted a vast amount of attention. An important technical issue that considerably complicates detailed calculations in any such scenario, is that once one violates Lorentz invariance the analysis of thresholds in both scattering and decay
processes becomes extremely subtle, with many new and naively unexpected effects. In the current article we develop several extremely general threshold theorems that depend only on the existence of some energy momentum relation E(p), eschewing even assumptions of isotropy or monotonicity. We shall argue that there are physically
interesting situations where such a level of generality is called for,
and that existing (partial) results in the literature make unnecessary technical assumptions. Even in this most general of settings, we show that at threshold all final state particles move with the same 3-velocity, while initial state particles must have 3-velocities
parallel/anti-parallel to the final state particles. In contrast the various 3-momenta can behave in a complicated and counter-intuitive manner.
arXiv.1111.6340 |
Jun 29 2011
13:00 |
SISSA, Large meeting room, 7th Floo
|
Cristiano Germani
(LMU, Muenchen)
|
UV-Protected Inflation |
ABSTRACT: In Natural Inflation, the Inflaton is a pseudo-Nambu-Goldstone boson which acquires a mass by explicit breaking of a global shift symmetry at scale f. In this case, for small field values, the potential is flat and stable under radiative corrections. Nevertheless, slow roll conditions enforce f>>M_p making the validity of the whole scenario questionable. In this talk, I will introduce the gravitationally enahnced friction mechanism that allows to take f<arXiv:1012.0853 |
Jun 22 2011
13:00 |
SISSA, room 005
|
Paolo Creminelli
(ICTP)
|
On graviton non-Gaussianities during inflation. The Pseudo-Conformal Universe: Scale Invariance from Spontaneous Breaking of Conformal Symmetry. |
ABSTRACT: On graviton non-Gaussianities during inflation.
Juan M. Maldacena, (Princeton, Inst. Advanced Study) , Guilherme L. Pimentel, (Princeton U.).
PUPT-2371, Apr 2011. 50pp.
e-Print: arXiv:1104.2846 [hep-th]
The Pseudo-Conformal Universe: Scale Invariance from Spontaneous Breaking of Conformal Symmetry.
Kurt Hinterbichler, Justin Khoury, . Jun 2011. 49pp. Temporary entry
e-Print: arXiv:1106.1428 [hep-th] |
Jun 08 2011
13:00 |
7th Floor Large Meeting Room
|
Dario Bettoni
(SISSA)
|
Can dark matter be a Bose-Einstein condensate? |
ABSTRACT: P.H.Chavanis, arXiv.1103.2050
P.H. Chavanis, arXiv:1103.2698
T. Harko, arXiv:1105.5198 |
Apr 15 2011
11:00 |
SISSA, room 137
|
Stefano Giaccari
(SISSA)
|
Hidden Conformal Symmetry of the Kerr Black Hole |
ABSTRACT: Extreme and very-near-extreme Kerr black holes have been conjectured to be holographically dual to two-dimensional CFTs by studying a near horizon scaling region where two copies of the Virasoro algebra can be defined. I will review a paper ( arXiv:1004.0996v1 [hep-th] ) in which the authors observe that at low frequencies the scalar wave equation is solved by hypergeometric functions, which suggests the existence of a hidden conformal symmetry. This fact allows them to conjecture that the Kerr black hole is dual to a 2D CFT even for generic mass M and angular momentum J. |
Apr 06 2011
13:00 |
SISSA, 7th Floor Large Meeting Room
|
Ravi Sheth
(ICTP)
|
ArXiv:1012.1335 |
ABSTRACT: In standard gravity and with gaussian initial conditions, halo (and hence galaxy) bias is independent of scale, at least on very large scales. This is not true in most departures from the standard model. Reference paper: arXiv:1012.1335.
I'd discuss scale-dependent halo bias in this and other models. |
Mar 30 2011
13:00 |
SISSA, 7th Floor Large Meeting Room
|
Carlo Baccigalupi
(SISSA)
|
On the way to detect B modes from inflation: issues and data analysis approaches |
ABSTRACT: http://xxx.lanl.gov/abs/1103.2554 |
Mar 02 2011
13:00 |
SISSA, Library reading room
|
Paolo Salucci
(SISSA)
|
A Novel Test of the Modified Newtonian Dynamics with Gas Rich Galaxies |
ABSTRACT: http://www.astro.umd.edu/~ssm/papers/PhysRevLett_2011_inpress.pdf |
Feb 23 2011
13:00 |
SISSA, Library reading room
|
Christopher Eling
(SISSA)
|
From Navier-Stokes to Einstein |
ABSTRACT: Everyday fluids are well-described by the incompressible Navier-Stokes equations. Although the equations are simple to state, they are very
interesting in both physics and mathematics due to turbulence and the existence and smoothness problems. In the past few years a connection to
another set of non-linear PDE's, the Einstein equations, has been developed out of the AdS/CFT correspondence in string theory but goes back to
observations about the dynamics of black holes from the 1970's. I will review these works and then describe the recent paper, http://arxiv.org/abs/1101.2451 which constructs a geometry "dual" to solutions of the NS equations. |
Feb 09 2011
13:00 |
SISSA, Library reading room
|
Martin Spinrath
(SISSA)
|
Search for Supersymmetry in pp Collisions at 7 TeV in Events with Jets and Missing Transverse Energy |
ABSTRACT: CMS collaboration, arXiv:1101.1628
|
Dec 14 2010
0:00 |
SISSA, Library reading room
|
Jason Dick
(SISSA)
|
Concentric circles in WMAP data may provide evidence of violent
pre-Big-Bang activity |
ABSTRACT: http://xxx.lanl.gov/abs/1011.3706
Authors: V.G.Gurzadyan, R.Penrose
as well as related papers.
|
Jun 25 2010
13:00 |
SiSSA, Room 128
|
Maryam Tavakoli
(SISSA)
|
PAMELA through a Magnetic Lense |
ABSTRACT: http://arxiv.org/abs/1005.4668 |
Apr 08 2010
13:00 |
SISSA, Reading Room
|
Barbara Sartoris
(OATS)
|
The potential of X-ray cluster surveys to constrain primordial non-Gaussianity |
ABSTRACT: http://arxiv.org/abs/1003.0841 |
Mar 30 2010
16:00 |
ICTP, Seminar Room
|
Alvaro De Rujula
(CERN, Geneva, Switzerland)
|
Higgs impostors at the LHC |
ABSTRACT: |
Mar 18 2010
13:00 |
SISSA, Reading Room
|
Jorge Noreńa
(SISSA)
|
Non-Gaussianity in the Large-Scale Structure |
ABSTRACT: Non-Gaussianity is the deviation of the distribution of primordial cosmological perturbations from a Gaussian. The observation of non-Gaussianity can be a powerful test and probe of inflation, it can be useful for distinguishing inflation from competing frameworks and putting constraints in inflationary models. Recently, there has been much interest in the study of the effects that non-Gaussianity can have on the large scale structure as a complementary alternative to the constraints on non-gaussianity from the CMB. I will explain the physical effects that lead to the modification of the LSS and briefly comment on recent observational bounds and future possibilities.
Some recent references:
http://arxiv.org/abs/1003.0841
http://arxiv.org/abs/1001.5217 |
Mar 04 2010
13:00 |
SISSA, Reading Room
|
Alessandro Lovato
(SISSA)
|
Composition and thermodynamics of nuclear matter with light clusters |
ABSTRACT: http://arxiv.org/abs/0908.2344 |
Feb 18 2010
13:00 |
SISSA, Reading Room
|
Guido D'Amico
(SISSA)
|
Symmetron Fields: Screening Long-Range Forces Through Local Symmetry Restoration |
ABSTRACT: http://arxiv.org/abs/1001.4525 |
Feb 04 2010
13:00 |
SISSA, Reading Room
|
Samuel Leach
(SISSA)
|
Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation |
ABSTRACT: http://arxiv.org/abs/1001.4538 |
Jan 28 2010
13:00 |
SISSA, Reading Room
|
Adriano Contillo
(SISSA)
|
Asymptotically Safe Inflation |
ABSTRACT: http://arxiv.org/abs/0911.3165 |
Jan 14 2010
13:00 |
SISSA, Reading Room
|
Piero Ullio
(SISSA)
|
Open discussion on the CDMS paper and outlook for dark matter searches |
ABSTRACT: http://arxiv.org/abs/0912.3592 |
Dec 10 2009
13:00 |
SISSA, Reading Room
|
Angus James Prain
(SISSA)
|
Information-theoretic natural ultraviolet cutoff for spacetime |
ABSTRACT: http://arxiv.org/abs/0908.3061 |
Oct 22 2009
13:00 |
SISSA, Reading Room
|
Aseem Paranjape
(ICTP)
|
Averaging and backreaction in cosmology |
ABSTRACT: The averaging problem in cosmology has attracted attention recently as a possible means of explaining the late time acceleration of the universe. I will briefly go through the arguments that lead to this proposal. I will then argue that when calculated carefully, the effect (so-called backreaction) of averaging cosmological inhomogeneities, is in fact very small (of order ~10^-4 today). Moreover, linear cosmological perturbation theory (PT) appears to be stable against the inclusion of the backreaction. The enhancement from nonlinear scales is also expected to be small, which is justified by studying the structure of the backreaction integrals in linear PT, and by exact toy models of nonlinear structure growth.
Hence backreaction cannot be large enough to explain the dark energy phenomenon.
It remains to be seen however, whether this small backreaction can lead to observable signatures. One possibility is the enhancement due to nonlinearities mentioned above, which could be probed more carefully in N-body simulations. Another interesting effect, in the radiation dominated era, is a (tiny!) modification of the equation of state of radiation due to an interaction with the backreaction terms.
I will discuss a few ideas relating to each of these.
References :
http://arxiv.org/abs/0811.2619
http://arxiv.org/abs/0906.3165 |
May 07 2009
13:00 |
SISSA, reading room
|
Marco Serone
(SISSA)
|
Quantum Gravity at a Lifshitz Point |
ABSTRACT: ArXiv:0901.3775 [hep-th] |
Apr 30 2009
13:00 |
SISSA, reading room
|
Vincenzo Vitagliano
(SISSA)
|
On the relation between the isotropy of the CMB and the geometry of the Universe |
ABSTRACT: Http://arxiv.org/abs/0903.3013 |
Apr 23 2009
13:00 |
SISSA, reading room
|
Claudia Hagedorn
(SISSA)
|
Hybrid natural inflation from non Abelian discrete symmetry |
ABSTRACT: ArXiv:0902.4676 [hep-ph] |
Apr 02 2009
13:00 |
SISSA, Reading Room
|
Adriano Contillo
(SISSA)
|
Warm-intermediate Inflationary Universe Model |
ABSTRACT: ArXiv:0903.4214 |
Mar 19 2009
13:00 |
SISSA, reading room
|
Serena Fagnocchi
(Enrico Fermi Ctr., Rome & Bologna U. & INFN, Bologna)
|
Numerical observation of Hawking radiation from acoustic black holes in atomic BECs |
ABSTRACT: New J.Phys.10:103001,2008.
e-Print: arXiv:0803.0507 [cond-mat.other] |
Mar 12 2009
13:00 |
SISSA, Reading Room
|
Matteo Viel
(OAT)
|
Recent Results in Intergalactic Cosmology |
ABSTRACT: |
Feb 26 2009
13:00 |
SISSA, Reading Room
|
Omar Zanusso
(SISSA)
|
"Running Inflation in the Standard Model"
Authors: Andrea De Simone, Mark P. Hertzberg, Frank Wilczek |
ABSTRACT: ArXiv:0812.4946 |
Feb 19 2009
13:00 |
SISSA, Reading Room
|
Samuel Leach
(SISSA)
|
Can the WMAP Haze really be a signature of annihilating neutralino dark matter?
Authors: Daniel T. Cumberbatch, Joe Zuntz, Hans Kristian Kamfjord Eriksen, Joe Silk |
ABSTRACT: ArXiv:0902.0039 |
