Talks

15529 - 15540 of 22691 Results

The black hole information paradox and its resolution

Ted Jacobson University of Maryland, College Park

January 17, 2013

PIRSA:13010021

General Relativity & Quantum Cosmology
12/13 PSI - Found Quantum Mechanics Lecture 9

Robert Spekkens Perimeter Institute for Theoretical Physics

January 17, 2013

PIRSA:13010076

High Energy Physics
12/13 PSI - String Theory Review Lecture 9

Barton Zwiebach Massachusetts Institute of Technology (MIT) - Department of Physics

January 17, 2013

PIRSA:13010057

High Energy Physics
12/13 PSI - Standard Model Review Lecture 9

Mark Wise California Institute of Technology (Caltech)

January 17, 2013

PIRSA:13010034

High Energy Physics
Einstein's gravity versus String Gravity

Barton Zwiebach Massachusetts Institute of Technology (MIT) - Department of Physics

January 16, 2013

PIRSA:13010103

High Energy Physics
12/13 PSI - Found Quantum Mechanics Lecture 8

Robert Spekkens Perimeter Institute for Theoretical Physics

January 16, 2013

PIRSA:13010075

High Energy Physics
12/13 PSI - String Theory Review Lecture 8

Barton Zwiebach Massachusetts Institute of Technology (MIT) - Department of Physics

January 16, 2013

PIRSA:13010054

High Energy Physics
12/13 PSI - Standard Model Review Lecture 8

Mark Wise California Institute of Technology (Caltech)

January 16, 2013

PIRSA:13010033

High Energy Physics
Superhorizon fluctuations in de Sitter and cosmological spacetimes

Guilherme Pimentel Universiteit van Amsterdam

January 15, 2013

PIRSA:13010001

High Energy Physics

Astrophysics
Boosted Multijet Resonances and New Color-Flow Variables

Brian Shuve Harvey Mudd College

January 15, 2013

PIRSA:13010104

High Energy Physics
12/13 PSI - Found Quantum Mechanics Lecture 7

Robert Spekkens Perimeter Institute for Theoretical Physics

January 15, 2013

PIRSA:13010074

High Energy Physics
Parameterizing dark sector perturbations

Jonathan Pearson Durham University

January 15, 2013

PIRSA:13010019

Astrophysics

The black hole information paradox and its resolution

Ted Jacobson University of Maryland, College Park

January 17, 2013

PIRSA:13010021

General Relativity & Quantum Cosmology

Both AdS/CFT duality and more general reasoning from quantum gravity point to a rich collection of boundary observables that always evolve unitarily. The physical quantum gravity states described by these observables must be solutions of the spatial diffeomorphism and Wheeler-deWitt constraints, which implies that the state space does not factorize into a tensor product of localized degrees of freedom. The "firewall" argument that unitarity of black hole evaporation is incompatible with a regular near horizon region is based on such a factorization, hence is not applicable in quantum gravity. A version of black hole complementarity resolves the apparent conflict. (I will also discuss doubts and questions.)
12/13 PSI - Found Quantum Mechanics Lecture 9

Robert Spekkens Perimeter Institute for Theoretical Physics

January 17, 2013

PIRSA:13010076

High Energy Physics
12/13 PSI - String Theory Review Lecture 9

Barton Zwiebach Massachusetts Institute of Technology (MIT) - Department of Physics

January 17, 2013

PIRSA:13010057

High Energy Physics
12/13 PSI - Standard Model Review Lecture 9

Mark Wise California Institute of Technology (Caltech)

January 17, 2013

PIRSA:13010034

High Energy Physics
Einstein's gravity versus String Gravity

Barton Zwiebach Massachusetts Institute of Technology (MIT) - Department of Physics

January 16, 2013

PIRSA:13010103

High Energy Physics

Gravity in string theory is a generalized version of Einstein's theory with some universal features that call for a reformulation of the key geometrical concepts. In addition to the metric tensor, for example, string theory contains an antisymmetric tensor and a dilaton that allow for extra symmetries. A new branch of mathematics, Generalized Geometry, suggests a framework that finds a realization in the recent Double Field Theory formulation of string gravity. I will describe the main ideas, the progress, and the mysteries that remain in the search for a proper description of string gravitation.
12/13 PSI - Found Quantum Mechanics Lecture 8

Robert Spekkens Perimeter Institute for Theoretical Physics

January 16, 2013

PIRSA:13010075

High Energy Physics
12/13 PSI - String Theory Review Lecture 8

Barton Zwiebach Massachusetts Institute of Technology (MIT) - Department of Physics

January 16, 2013

PIRSA:13010054

High Energy Physics
12/13 PSI - Standard Model Review Lecture 8

Mark Wise California Institute of Technology (Caltech)

January 16, 2013

PIRSA:13010033

High Energy Physics
Superhorizon fluctuations in de Sitter and cosmological spacetimes

Guilherme Pimentel Universiteit van Amsterdam

January 15, 2013

PIRSA:13010001

High Energy Physics

Astrophysics

I will discuss superhorizon fluctuations in de Sitter space. The first part of the talk will focus on computing entanglement entropies of field theories in a fixed de Sitter background. Those computations are done for free theories and also theories with gravity duals. If time permits, I will also discuss superhorizon fluctuations in cosmological backgrounds. In particular, I focus on showing that subhorizon fluctuations can not produce any significant backreaction on superhorizon modes. If those late time effects existed, one in principle could not trust the scale invariant spectrum of inflationary theories to be the source of the spectrum of thermal fluctuations of the CMB.
Boosted Multijet Resonances and New Color-Flow Variables

Brian Shuve Harvey Mudd College

January 15, 2013

PIRSA:13010104

High Energy Physics
12/13 PSI - Found Quantum Mechanics Lecture 7

Robert Spekkens Perimeter Institute for Theoretical Physics

January 15, 2013

PIRSA:13010074

High Energy Physics
Parameterizing dark sector perturbations

Jonathan Pearson Durham University

January 15, 2013

PIRSA:13010019

Astrophysics

When recent observational evidence and the GR+FRW+CDM model are combined we obtain the result that the Universe is accelerating, where the acceleration is due to some not-yet-understood "dark sector". There has been a considerable number of theoretical models constructed in an attempt to provide an "understanding" of the dark sector: dark energy and modified gravity theories. The proliferation of modified gravity and dark energy models has brought to light the need to construct a "generic" way to parameterize the dark sector. We will discuss our new way of approaching this problem, looking at linearised perturbations. Our approach is inspired by that taken in particle physics, where the most general modifications to the standard model are written down for a given field content that is compatible with some assumed symmetry (which we take to be isotropy of the background spatial sections). Our emphasis is on constructing a theoretically motivated toolkit which can be used to extract meaningful information about the dark sector (such as its field content). We find, for example, that the observational impact of very broad classes of theories can be encoded by a very small (less than 5) number of parameters. It is these parameters which we hope to measure with observational data.

Title	Date	Collection	Type	Info
The black hole information paradox and its resolution	2013‑01‑17	Quantum Gravity	Scientific Series	View details
12/13 PSI - Found Quantum Mechanics Lecture 9	2013‑01‑17	12/13 PSI - Found Quantum Mechanics	Course	View details
12/13 PSI - String Theory Review Lecture 9	2013‑01‑17	12/13 PSI - String Theory Review	Course	View details
12/13 PSI - Standard Model Review Lecture 9	2013‑01‑17	12/13 PSI - Standard Model Review	Course	View details
Einstein's gravity versus String Gravity	2013‑01‑16	Colloquium	Scientific Series	View details
12/13 PSI - Found Quantum Mechanics Lecture 8	2013‑01‑16	12/13 PSI - Found Quantum Mechanics	Course	View details
12/13 PSI - String Theory Review Lecture 8	2013‑01‑16	12/13 PSI - String Theory Review	Course	View details
12/13 PSI - Standard Model Review Lecture 8	2013‑01‑16	12/13 PSI - Standard Model Review	Course	View details
Superhorizon fluctuations in de Sitter and cosmological spacetimes	2013‑01‑15	Quantum Fields and Strings	Scientific Series	View details
Boosted Multijet Resonances and New Color-Flow Variables	2013‑01‑15	Particle Physics	Scientific Series	View details
12/13 PSI - Found Quantum Mechanics Lecture 7	2013‑01‑15	12/13 PSI - Found Quantum Mechanics	Course	View details
Parameterizing dark sector perturbations	2013‑01‑15	Cosmology and Gravitation	Scientific Series	View details

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Format results

The black hole information paradox and its resolution

12/13 PSI - Found Quantum Mechanics Lecture 9

12/13 PSI - String Theory Review Lecture 9

12/13 PSI - Standard Model Review Lecture 9

Einstein's gravity versus String Gravity

12/13 PSI - Found Quantum Mechanics Lecture 8

12/13 PSI - String Theory Review Lecture 8

12/13 PSI - Standard Model Review Lecture 8

Superhorizon fluctuations in de Sitter and cosmological spacetimes

Boosted Multijet Resonances and New Color-Flow Variables

12/13 PSI - Found Quantum Mechanics Lecture 7

Parameterizing dark sector perturbations

The black hole information paradox and its resolution

12/13 PSI - Found Quantum Mechanics Lecture 9

12/13 PSI - String Theory Review Lecture 9

12/13 PSI - Standard Model Review Lecture 9

Einstein's gravity versus String Gravity

12/13 PSI - Found Quantum Mechanics Lecture 8

12/13 PSI - String Theory Review Lecture 8

12/13 PSI - Standard Model Review Lecture 8

Superhorizon fluctuations in de Sitter and cosmological spacetimes

Boosted Multijet Resonances and New Color-Flow Variables

12/13 PSI - Found Quantum Mechanics Lecture 7

Parameterizing dark sector perturbations