Talks

13837 - 13848 of 22687 Results

PHYS 781 - Lecture 11

Niayesh Afshordi University of Waterloo

October 28, 2014

PIRSA:14100055
Entanglement entropy of Wilson loops: Holography and matrix models

Simon Gentle University of California, Los Angeles

October 28, 2014

PIRSA:14100006

High Energy Physics
Discovering the QCD Axion with Black Holes and Gravitational Waves

Masha Baryakhtar University of Washington

October 28, 2014

PIRSA:14100049

High Energy Physics
Beyond slow-roll - Daan Meerburg

October 28, 2014

PIRSA:14100119

Astrophysics
14/15 PSI - Conformal Field Theory - Lecture 14

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 24, 2014

PIRSA:14100026
PHYS 781 - Lecture 10

Niayesh Afshordi University of Waterloo

October 24, 2014

PIRSA:14100064
14/15 PSI - Statistical Mechanics - Lecture 14

Anton Burkov University of Waterloo

October 24, 2014

PIRSA:14100102
14/15 PSI - Quantum Field Theory I (A) - Lecture 14

Tibra Ali Perimeter Institute for Theoretical Physics

Dan Wohns Perimeter Institute for Theoretical Physics

October 24, 2014

PIRSA:14100045
Non-Equilibrium Thermodynamics of a Gravitational Screen

Laurent Freidel Perimeter Institute for Theoretical Physics

October 23, 2014

PIRSA:14100110
Holographic Thermalization and Chaos

Luis Lehner Perimeter Institute for Theoretical Physics

October 23, 2014

PIRSA:14100108
Economic Inequality

Matteo Smerlak Capital Fund Management S.A.

October 23, 2014

PIRSA:14100109
Ergodicity and its breaking in quantum systems of many particles

Dmitry Abanin Princeton University

October 23, 2014

PIRSA:14100107

PHYS 781 - Lecture 11

Niayesh Afshordi University of Waterloo

October 28, 2014

PIRSA:14100055
Entanglement entropy of Wilson loops: Holography and matrix models

Simon Gentle University of California, Los Angeles

October 28, 2014

PIRSA:14100006

High Energy Physics

A half-BPS circular Wilson loop in maximally supersymmetric SU(N) Yang-Mills theory in an arbitrary representation is described by a Gaussian matrix model with a particular insertion. The additional entanglement entropy of a spherical region in the presence of such a loop was recently computed by Lewkowycz and Maldacena using exact matrix model results. In this talk I will utilise the supergravity solutions that are dual to such Wilson loops in large representations to calculate this entropy holographically. Employing the results of Gomis, Matsuura, Okuda and Trancanelli to express this holographic entanglement entropy in a matrix model language, I will demonstrate complete agreement with the formula derived by Lewkowycz and Maldacena.
Discovering the QCD Axion with Black Holes and Gravitational Waves

Masha Baryakhtar University of Washington

October 28, 2014

PIRSA:14100049

High Energy Physics

In the next few years, Advanced LIGO will be the first experiment to detect gravitational waves. Through superradiance of stellar black holes, it may also be the first experiment to discover the QCD axion with decay constant around or above the GUT scale. When an axion's Compton wavelength is comparable to the size of a black hole, the axion binds to the black hole, forming a "gravitational atom". Due to superradiance, the number of axions occupying the bound levels grows exponentially, extracting energy and angular momentum from the black hole. I will discuss the promising gravitational wave signals from axions transitioning between levels of the gravitational atom and axions annihilating to gravitons. Events for axions in the range 10^−13 to 10^−10 eV can be visible at aLIGO. The signals produced are long-lasting, monochromatic, and can be distinguished from ordinary astrophysical sources. These signatures are also promising for lighter axions at future, lower-frequency, GW observatories. I will also present our updated exclusion on the QCD axion mass range of 6*10^−13 eV < ma < 1.5*10^−11 eV imposed by black hole spin measurements.
Beyond slow-roll - Daan Meerburg

October 28, 2014

PIRSA:14100119

Astrophysics

We live in exciting times for cosmologists. There is a plethora of cosmological experiments that allow us to reconstruct the earliest moments in the Universe and test our ideas on how the Universe came into existence. Current data appear to favor an inflationary model that produces adiabatic, scale free, Gaussian fluctuations with an amplitude of 10^-5 in units of mK. WIthin the realm of cosmological models, it appears that such conditions are easily accomplished if we have a single light field slowly rolling down its potential. In this talk, I will investigate the possibility to what extend our current observations would allow for a deviation from slow-roll: several class of models predicts that the fluctuation spectra will contain superimposed features on top of their slow-roll solution. I will discuss these models and explain a novel way of extract these features from the data, both in the power spectrum as well as in the bispectrum. I will give the latest constraints from current cosmological surveys. In light of the possible detection of primordial gravitational waves, I will show that there exists evidence (3 sigma) that the data prefer a long wavelength feature driven by axion monodromy, a model that naturally predicts large tensor modes. From this I will derive a constraint on the axion decay constant. I will conclude with a discussion on how observations of higher order statistics and large scale structure could further constrain these models.
14/15 PSI - Conformal Field Theory - Lecture 14

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 24, 2014

PIRSA:14100026
PHYS 781 - Lecture 10

Niayesh Afshordi University of Waterloo

October 24, 2014

PIRSA:14100064
14/15 PSI - Statistical Mechanics - Lecture 14

Anton Burkov University of Waterloo

October 24, 2014

PIRSA:14100102
14/15 PSI - Quantum Field Theory I (A) - Lecture 14

Tibra Ali Perimeter Institute for Theoretical Physics

Dan Wohns Perimeter Institute for Theoretical Physics

October 24, 2014

PIRSA:14100045
Non-Equilibrium Thermodynamics of a Gravitational Screen

Laurent Freidel Perimeter Institute for Theoretical Physics

October 23, 2014

PIRSA:14100110
Holographic Thermalization and Chaos

Luis Lehner Perimeter Institute for Theoretical Physics

October 23, 2014

PIRSA:14100108
Economic Inequality

Matteo Smerlak Capital Fund Management S.A.

October 23, 2014

PIRSA:14100109
Ergodicity and its breaking in quantum systems of many particles

Dmitry Abanin Princeton University

October 23, 2014

PIRSA:14100107

Title	Date	Collection	Type	Info
PHYS 781 - Lecture 11	2014‑10‑28	PHYS 781 - Fundamentals of Astrophysics	Course	View details
Entanglement entropy of Wilson loops: Holography and matrix models	2014‑10‑28	Quantum Fields and Strings	Scientific Series	View details
Discovering the QCD Axion with Black Holes and Gravitational Waves	2014‑10‑28	Particle Physics	Scientific Series	View details
Beyond slow-roll - Daan Meerburg	2014‑10‑28	Cosmology and Gravitation	Scientific Series	View details
14/15 PSI - Conformal Field Theory - Lecture 14	2014‑10‑24	14/15 PSI - Conformal Field Theory	Course	View details
PHYS 781 - Lecture 10	2014‑10‑24	PHYS 781 - Fundamentals of Astrophysics	Course	View details
14/15 PSI - Statistical Mechanics - Lecture 14	2014‑10‑24	14/15 PSI - Statistical Mechanics	Course	View details
14/15 PSI - Quantum Field Theory I (A) - Lecture 14	2014‑10‑24	14/15 PSI - Quantum Field Theory	Course	View details
Non-Equilibrium Thermodynamics of a Gravitational Screen	2014‑10‑23		Conference	View details
Holographic Thermalization and Chaos	2014‑10‑23		Conference	View details
Economic Inequality	2014‑10‑23		Conference	View details
Ergodicity and its breaking in quantum systems of many particles	2014‑10‑23		Conference	View details

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Format results

PHYS 781 - Lecture 11

Entanglement entropy of Wilson loops: Holography and matrix models

Discovering the QCD Axion with Black Holes and Gravitational Waves

Beyond slow-roll - Daan Meerburg

14/15 PSI - Conformal Field Theory - Lecture 14

PHYS 781 - Lecture 10

14/15 PSI - Statistical Mechanics - Lecture 14

14/15 PSI - Quantum Field Theory I (A) - Lecture 14

Non-Equilibrium Thermodynamics of a Gravitational Screen

Holographic Thermalization and Chaos

Economic Inequality

Ergodicity and its breaking in quantum systems of many particles

PHYS 781 - Lecture 11

Entanglement entropy of Wilson loops: Holography and matrix models

Discovering the QCD Axion with Black Holes and Gravitational Waves

Beyond slow-roll - Daan Meerburg

14/15 PSI - Conformal Field Theory - Lecture 14

PHYS 781 - Lecture 10

14/15 PSI - Statistical Mechanics - Lecture 14

14/15 PSI - Quantum Field Theory I (A) - Lecture 14

Non-Equilibrium Thermodynamics of a Gravitational Screen

Holographic Thermalization and Chaos

Economic Inequality

Ergodicity and its breaking in quantum systems of many particles