Talks

12973 - 12984 of 20131 Results

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
12/13 PSI - String Theory Review Lecture 7

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

January 15, 2013

PIRSA:13010053

High Energy Physics
12/13 PSI - Standard Model Review Lecture 7

Mark Wise California Institute of Technology (Caltech)

January 15, 2013

PIRSA:13010032

High Energy Physics
Exotic topological order from quantum fractal code

Beni Yoshida Perimeter Institute for Theoretical Physics

January 14, 2013

PIRSA:13010101

Quantum Physics
12/13 PSI - Found Quantum Mechanics Lecture 6

Robert Spekkens Perimeter Institute for Theoretical Physics

January 14, 2013

PIRSA:13010073

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.
12/13 PSI - String Theory Review Lecture 7

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

January 15, 2013

PIRSA:13010053

High Energy Physics
12/13 PSI - Standard Model Review Lecture 7

Mark Wise California Institute of Technology (Caltech)

January 15, 2013

PIRSA:13010032

High Energy Physics
Exotic topological order from quantum fractal code

Beni Yoshida Perimeter Institute for Theoretical Physics

January 14, 2013

PIRSA:13010101

Quantum Physics

We present a family of three-dimensional local quantum codes with pairs of fractal logical operators. It has two polynomials over finite fields as input parameters which generate fractal shapes of anti-commuting logical operators, and possesses exotic topological order with quantum glassiness which is beyond descriptions of conventional topological field theory. A necessary and sufficient condition for being free from string-like logical operators is obtained under which the model works as marginally self-correcting quantum memory. We also provide theoretical tools to analyze physical and coding properties of translation symmetric stabilizer Hamiltonians.
12/13 PSI - Found Quantum Mechanics Lecture 6

Robert Spekkens Perimeter Institute for Theoretical Physics

January 14, 2013

PIRSA:13010073

High Energy Physics

Title	Date	Collection	Type	Info
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
12/13 PSI - String Theory Review Lecture 7	2013‑01‑15	12/13 PSI - String Theory Review	Course	View details
12/13 PSI - Standard Model Review Lecture 7	2013‑01‑15	12/13 PSI - Standard Model Review	Course	View details
Exotic topological order from quantum fractal code	2013‑01‑14	Perimeter Institute Quantum Discussions	Scientific Series	View details
12/13 PSI - Found Quantum Mechanics Lecture 6	2013‑01‑14	12/13 PSI - Found Quantum Mechanics	Course	View details

Supported by

Format results

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

12/13 PSI - String Theory Review Lecture 7

12/13 PSI - Standard Model Review Lecture 7

Exotic topological order from quantum fractal code

12/13 PSI - Found Quantum Mechanics Lecture 6

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

12/13 PSI - String Theory Review Lecture 7

12/13 PSI - Standard Model Review Lecture 7

Exotic topological order from quantum fractal code

12/13 PSI - Found Quantum Mechanics Lecture 6