Talks

9781 - 9792 of 18100 Results

13/14 PSI - String Theory Review - Lecture 3

Davide Gaiotto Perimeter Institute for Theoretical Physics

January 29, 2014

PIRSA:14010072
13/14 PSI - Condensed Matter Review - Lecture 3

Alioscia Hamma University of Naples Federico II

January 29, 2014

PIRSA:14010077
Introduction to Quantum Field Theory for Cosmology - Lecture 7

Achim Kempf University of Waterloo

January 28, 2014

PIRSA:14010003
Mayer-Cluster Expansion of Instanton Partition Functions and Thermodynamic Bethe Ansatz

Carlo Meneghelli University of Oxford

January 28, 2014

PIRSA:14010096

High Energy Physics
13/14 PSI - Cosmology Review - Lecture 2

Latham Boyle University of Edinburgh

January 28, 2014

PIRSA:14010066
New light on 21cm intensity fluctuations from the dark ages

January 28, 2014

PIRSA:14010097

Astrophysics
13/14 PSI - String Theory Review - Lecture 2

Davide Gaiotto Perimeter Institute for Theoretical Physics

January 28, 2014

PIRSA:14010071
13/14 PSI - Condensed Matter Review - Lecture 2

Alioscia Hamma University of Naples Federico II

January 28, 2014

PIRSA:14010076
13/14 PSI - Cosmology Review - Lecture 1

Latham Boyle University of Edinburgh

January 27, 2014

PIRSA:14010065
13/14 PSI - String Theory Review - Lecture 1

Davide Gaiotto Perimeter Institute for Theoretical Physics

January 27, 2014

PIRSA:14010070
13/14 PSI - Condensed Matter Review - Lecture 1

Alioscia Hamma University of Naples Federico II

January 27, 2014

PIRSA:14010075
Introduction to Effective Field Theories - Lecture 6

Cliff Burgess McMaster University

January 24, 2014

PIRSA:14010093

13/14 PSI - String Theory Review - Lecture 3

Davide Gaiotto Perimeter Institute for Theoretical Physics

January 29, 2014

PIRSA:14010072
13/14 PSI - Condensed Matter Review - Lecture 3

Alioscia Hamma University of Naples Federico II

January 29, 2014

PIRSA:14010077
Introduction to Quantum Field Theory for Cosmology - Lecture 7

Achim Kempf University of Waterloo

January 28, 2014

PIRSA:14010003
Mayer-Cluster Expansion of Instanton Partition Functions and Thermodynamic Bethe Ansatz

Carlo Meneghelli University of Oxford

January 28, 2014

PIRSA:14010096

High Energy Physics

In arXiv:0908.4052, Nekrasov and Shatashvili pointed out that the N=2 instanton partition function in a special limit of the Omega-deformation 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.
13/14 PSI - Cosmology Review - Lecture 2

Latham Boyle University of Edinburgh

January 28, 2014

PIRSA:14010066
New light on 21cm intensity fluctuations from the dark ages

January 28, 2014

PIRSA:14010097

Astrophysics

Fluctuations of the 21 cm brightness temperature before the formation of the first stars hold the promise of becoming a high-precision cosmological probe in the future. The growth of over densities is very well described by perturbation theory at that epoch and the signal can in principle be predicted to arbitrary accuracy for given cosmological parameters. Recently, Tseliakhovich and Hirata pointed out a previously neglected and important physical effect, due to the fact that baryons and cold dark matter (CDM) have supersonic relative velocities after recombination. This relative velocity suppresses the growth of matter fluctuations on scales k∼10−10^3 Mpc^−1. In addition, the amplitude of the small-scale power spectrum is modulated on the large scales over which the relative velocity varies, corresponding to k∼0.005−1 Mpc^−1. In this talk, I will describe the effect of the relative velocity on 21 cm brightness temperature fluctuations from redshifts z≥30. I will show that the 21 cm power spectrum is affected on most scales. On small scales, the signal is typically suppressed several tens of percent, except for extremely small scales (k≳2000 Mpc−1) for which the fluctuations are boosted by resonant excitation of acoustic waves. On large scales, 21 cm fluctuations are enhanced due to the non-linear dependence of the brightness temperature on the underlying gas density and temperature. The enhancement of the 21 cm power spectrum is of a few percent at k∼0.1 Mpc−1 and up to tens of percent at k≲0.005 Mpc−1, for standard ΛCDM cosmology. In principle this effect allows to probe the small-scale matter power spectrum not only through a measurement of small angular scales but also through its effect on large angular scales.
13/14 PSI - String Theory Review - Lecture 2

Davide Gaiotto Perimeter Institute for Theoretical Physics

January 28, 2014

PIRSA:14010071
13/14 PSI - Condensed Matter Review - Lecture 2

Alioscia Hamma University of Naples Federico II

January 28, 2014

PIRSA:14010076
13/14 PSI - Cosmology Review - Lecture 1

Latham Boyle University of Edinburgh

January 27, 2014

PIRSA:14010065
13/14 PSI - String Theory Review - Lecture 1

Davide Gaiotto Perimeter Institute for Theoretical Physics

January 27, 2014

PIRSA:14010070
13/14 PSI - Condensed Matter Review - Lecture 1

Alioscia Hamma University of Naples Federico II

January 27, 2014

PIRSA:14010075
Introduction to Effective Field Theories - Lecture 6

Cliff Burgess McMaster University

January 24, 2014

PIRSA:14010093

Title	Date	Collection	Type	Info
13/14 PSI - String Theory Review - Lecture 3	2014‑01‑29	13/14 PSI - String Theory Review	Course	View details
13/14 PSI - Condensed Matter Review - Lecture 3	2014‑01‑29	13/14 PSI - Condensed Matter Review	Course	View details
Introduction to Quantum Field Theory for Cosmology - Lecture 7	2014‑01‑28	Quantum Field Theory for Cosmology - 2014	Course	View details
Mayer-Cluster Expansion of Instanton Partition Functions and Thermodynamic Bethe Ansatz	2014‑01‑28	Quantum Fields and Strings	Scientific Series	View details
13/14 PSI - Cosmology Review - Lecture 2	2014‑01‑28	13/14 PSI - Cosmology Review	Course	View details
New light on 21cm intensity fluctuations from the dark ages	2014‑01‑28	Cosmology and Gravitation	Scientific Series	View details
13/14 PSI - String Theory Review - Lecture 2	2014‑01‑28	13/14 PSI - String Theory Review	Course	View details
13/14 PSI - Condensed Matter Review - Lecture 2	2014‑01‑28	13/14 PSI - Condensed Matter Review	Course	View details
13/14 PSI - Cosmology Review - Lecture 1	2014‑01‑27	13/14 PSI - Cosmology Review	Course	View details
13/14 PSI - String Theory Review - Lecture 1	2014‑01‑27	13/14 PSI - String Theory Review	Course	View details
13/14 PSI - Condensed Matter Review - Lecture 1	2014‑01‑27	13/14 PSI - Condensed Matter Review	Course	View details
Introduction to Effective Field Theories - Lecture 6	2014‑01‑24	Introduction to Effective Field Theories	Course	View details

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Format results

13/14 PSI - String Theory Review - Lecture 3

13/14 PSI - Condensed Matter Review - Lecture 3

Introduction to Quantum Field Theory for Cosmology - Lecture 7

Mayer-Cluster Expansion of Instanton Partition Functions and Thermodynamic Bethe Ansatz

13/14 PSI - Cosmology Review - Lecture 2

New light on 21cm intensity fluctuations from the dark ages

13/14 PSI - String Theory Review - Lecture 2

13/14 PSI - Condensed Matter Review - Lecture 2

13/14 PSI - Cosmology Review - Lecture 1

13/14 PSI - String Theory Review - Lecture 1

13/14 PSI - Condensed Matter Review - Lecture 1

Introduction to Effective Field Theories - Lecture 6

13/14 PSI - String Theory Review - Lecture 3

13/14 PSI - Condensed Matter Review - Lecture 3

Introduction to Quantum Field Theory for Cosmology - Lecture 7

Mayer-Cluster Expansion of Instanton Partition Functions and Thermodynamic Bethe Ansatz

13/14 PSI - Cosmology Review - Lecture 2

New light on 21cm intensity fluctuations from the dark ages

13/14 PSI - String Theory Review - Lecture 2

13/14 PSI - Condensed Matter Review - Lecture 2

13/14 PSI - Cosmology Review - Lecture 1

13/14 PSI - String Theory Review - Lecture 1

13/14 PSI - Condensed Matter Review - Lecture 1

Introduction to Effective Field Theories - Lecture 6