Talks

10969 - 10980 of 16889 Results

AdS(3)/CFT(2) correspondence and integrability

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 09, 2012

PIRSA:12100062

Quantum Fields and Strings

Mathematical physics
Voids in the SDSS: from demography to cosmology

Paul Sutter Institut d'Astrophysique de Paris

October 09, 2012

PIRSA:12100041

Cosmology
Scalars with Higher Derivatives in Supergravity and Cosmology

Jean-Luc Lehners Self Employed

October 09, 2012

PIRSA:12100042

Cosmology
Condensed Matter - Lecture 1

Assa Auerbach Technion – Israel Institute of Technology

October 09, 2012

PIRSA:12100022

Condensed Matter
Quantum Field Theory - Lecture 1

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 09, 2012

PIRSA:12100004

Quantum Fields and Strings
Testing Strong-Field General Relativity with Black Holes

Tim Johannsen

October 04, 2012

PIRSA:12100049
Probability and Statistics with Prof David Spiegelhalter - Lecture 14

October 04, 2012

PIRSA:12100137
Massey Lecture Kick-off - Neil Turok - The Universe Within

Neil Turok University of Edinburgh

October 03, 2012

PIRSA:12100057
Massey Lecture - Other location

Neil Turok University of Edinburgh

October 03, 2012

PIRSA:12100133

Cosmology
Probability and Statistics with Prof David Spiegelhalter - Lecture 13

October 03, 2012

PIRSA:12100136
A Higgs but no sparticles yet: what it means for the (p)MSSM

Ahmed Ismail University of Pittsburgh

October 02, 2012

PIRSA:12100052

Particle Physics
Homogeneous and Isotropic Universe from Nonlinear Massive Gravity

A. Emir Gumrukcuoglu

October 02, 2012

PIRSA:12100002

Cosmology

AdS(3)/CFT(2) correspondence and integrability

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 09, 2012

PIRSA:12100062

Quantum Fields and Strings

Mathematical physics

Integrability has been successfully used to compute the non-perturbative spectrum, Wilson loops and scattering amplitudes in the AdS/CFT correspondence. Most of these results apply to N=4, D=4 SYM / strings on AdS(5)xS(5). Strings on AdS(3)xM, where M is either S(3)xT(4) or S(3)xS(3)xS(1), are also integrable and potentially solvable by the same methods (Bethe ansatz, Y-system, TBA etc). An interesting aspect of string theory on AdS(3) is a large number of parameters that preserve integrability. One parameters, in particular, interpolates between the integrable RR AdS(3) background and conformal NSNS background described by a non-compact WZW model. Another interesting aspect of string theory on AdS(3) is emergence of target-space Viraroso symmetry. I will review how integrability arises in the AdS(3)/CFT(2) correspondence, and will describe what is (not) know about the Bethe ansatz solution of the relevant sigma-models.
Voids in the SDSS: from demography to cosmology

Paul Sutter Institut d'Astrophysique de Paris

October 09, 2012

PIRSA:12100041

Cosmology

Cosmic voids are potentially a rich source of information for both astrophysics and cosmology. To enable such science, we produce the most comprehensive void catalog to date using the Sloan Digital Sky Survey Data Release 7 main sample out to redshift z = 0.2 and the Luminous Red Galaxy sample out to z = 0.44. Using a modified version of the parameter-free void finder ZOBOV, we fully take into account the presence of survey boundary and masks. We discuss basic catalog statistics such as number counts and redshift distributions, as well as describe some example data products derived from our catalog, such as radial density profiles and projected density maps. Using this catalog, we report on the first application of the Alcock-Paczynski test to stacked voids in spectroscopic redshift surveys by applying the shape-fitting procedure presented in Lavaux & Wandelt (2011) to ten void stacks out to redshift z = 0.36. Our results are consistent with WMAP 7-year cosmological constraints. We compare our results to alternate methods of constructing void stacks and comment on future observational prospects.
Scalars with Higher Derivatives in Supergravity and Cosmology

Jean-Luc Lehners Self Employed

October 09, 2012

PIRSA:12100042

Cosmology

There are many situations in cosmology that motivate the study of scalar fields with higher-derivative actions. The best-known such situations are probably k-inflation (with DBI-inflation being a special case) and models based on galileon theories, but even eternal inflation and cyclic universes provide good reasons to study such theories. After an extended discussion of the motivations, I will show how scalar field theories with higher derivatives can be constructed in (minimal, 4-dimensional) supergravity, and will discuss their properties, especially in regard to their cosmological applications.
Condensed Matter - Lecture 1

Assa Auerbach Technion – Israel Institute of Technology

October 09, 2012

PIRSA:12100022

Condensed Matter
Quantum Field Theory - Lecture 1

Konstantin Zarembo Nordic Institute for Theoretical Physics

October 09, 2012

PIRSA:12100004

Quantum Fields and Strings
Testing Strong-Field General Relativity with Black Holes

Tim Johannsen

October 04, 2012

PIRSA:12100049
Probability and Statistics with Prof David Spiegelhalter - Lecture 14

October 04, 2012

PIRSA:12100137

We shall follow the growth of probability theory and applications from the 1650s onwards, in parallel with the development of statistical inference. Bayesian, Neyman-Pearson hypothesis testing and Fisherian likelihood methods will all be covered, with an emphasis on relating theory to a wide range of applications. Practical sessions will use SciPy and feature closed-form solutions, iterative and Monte Carlo simulation methods.
Massey Lecture Kick-off - Neil Turok - The Universe Within

Neil Turok University of Edinburgh

October 03, 2012

PIRSA:12100057
Massey Lecture - Other location

Neil Turok University of Edinburgh

October 03, 2012

PIRSA:12100133

Cosmology
Probability and Statistics with Prof David Spiegelhalter - Lecture 13

October 03, 2012

PIRSA:12100136

We shall follow the growth of probability theory and applications from the 1650s onwards, in parallel with the development of statistical inference. Bayesian, Neyman-Pearson hypothesis testing and Fisherian likelihood methods will all be covered, with an emphasis on relating theory to a wide range of applications. Practical sessions will use SciPy and feature closed-form solutions, iterative and Monte Carlo simulation methods.
A Higgs but no sparticles yet: what it means for the (p)MSSM

Ahmed Ismail University of Pittsburgh

October 02, 2012

PIRSA:12100052

Particle Physics

The phenomenological Minimal Supersymmetric Standard Model (pMSSM) provides a broad perspective on supersymmetric phenomenology. We have generated two large sets of pMSSM models with neutralino and gravitino LSPs, with sparticle masses extending up to 4 TeV. In this talk, I will discuss the implications of searches for supersymmetry and the Higgs, with particular attention to naturalness. In particular, we find that while sparticle spectra with moderately light stops are still allowed, such stops are difficult to find experimentally because of a wide array of possible cascade decays.
Homogeneous and Isotropic Universe from Nonlinear Massive Gravity

A. Emir Gumrukcuoglu

October 02, 2012

PIRSA:12100002

Cosmology

The question of finite range gravity, or equivalently, whether graviton can have a non-zero mass, has been one of the major challenges in classical field theory for the last 70 years. Generically, a massive gravity theory contains an extra degree in addition to the 5 polarizations of massive graviton, which turns out to be a ghost. Recently, de Rham, Gabadadze and Tolley constructed a nonlinear theory of massive gravity, which successfully eliminates the ghost. Moreover, the theory has also phenomenological relevance, since the graviton mass may account for the accelerated expansion of the present universe, providing an alternative to dark energy. I will present self-accelerating cosmological solutions in the framework of this theory. The cosmological perturbations around these backgrounds have an interesting behavior: instead of the 5 degrees of freedom expected from a massive spin-2 field, only the 2 gravity wave polarizations are dynamical, at linear level. However, nonlinear analysis of the extra modes reveal the existence of ghost instabilities. This implies that a consistent universe solution in this theory should be inhomogeneous and/or anisotropic.

Title	Date	Collection	Type	Info
AdS(3)/CFT(2) correspondence and integrability	2012‑10‑09	Quantum Fields and Strings	Scientific Series	View details
Voids in the SDSS: from demography to cosmology	2012‑10‑09	Cosmology and Gravitation	Scientific Series	View details
Scalars with Higher Derivatives in Supergravity and Cosmology	2012‑10‑09	Cosmology and Gravitation	Scientific Series	View details
Condensed Matter - Lecture 1	2012‑10‑09	12/13 PSI - Condensed Matter	Course	View details
Quantum Field Theory - Lecture 1	2012‑10‑09	12/13 PSI - Quantum Field Theory 1	Course	View details
Testing Strong-Field General Relativity with Black Holes	2012‑10‑04	Strong Gravity	Scientific Series	View details
Probability and Statistics with Prof David Spiegelhalter - Lecture 14	2012‑10‑04	Probability and Statistics	Course	View details
Massey Lecture Kick-off - Neil Turok - The Universe Within	2012‑10‑03	Public Lecture Series	Public Lectures	View details
Massey Lecture - Other location	2012‑10‑03	Public Lecture Series	Public Lectures	View details
Probability and Statistics with Prof David Spiegelhalter - Lecture 13	2012‑10‑03	Probability and Statistics	Course	View details
A Higgs but no sparticles yet: what it means for the (p)MSSM	2012‑10‑02	Particle Physics	Scientific Series	View details
Homogeneous and Isotropic Universe from Nonlinear Massive Gravity	2012‑10‑02	Cosmology and Gravitation	Scientific Series	View details

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