Talks

9625 - 9636 of 18076 Results

13/14 PSI - Beyond the Standard Model - Lecture 7

Robert Mann University of Waterloo

February 27, 2014

PIRSA:14020059
Nonlocal cosmology

Richard Woodard University of Florida

February 27, 2014

PIRSA:14020137

General Relativity & Quantum Cosmology
13/14 PSI - Quantum Information Review - Lecture 9

Andrew Childs University of Waterloo

February 27, 2014

PIRSA:14020081
13/14 PSI - Quantum Gravity Review - Lecture 8

Bianca Dittrich Perimeter Institute for Theoretical Physics

February 27, 2014

PIRSA:14020070
À la recherche du temps perdu - Templeton Frontiers Colloquia

Flavio Mercati University of Naples Federico II

February 26, 2014

PIRSA:14020100

General Relativity & Quantum Cosmology
13/14 PSI - Quantum Information Review - Lecture 8

Andrew Childs University of Waterloo

February 26, 2014

PIRSA:14020080
Spacetime approach to force-free magnetospheres - Lecture 4

Ted Jacobson University of Maryland, College Park

February 26, 2014

PIRSA:14020158
13/14 PSI - Quantum Gravity Review - Lecture 7

Bianca Dittrich Perimeter Institute for Theoretical Physics

February 26, 2014

PIRSA:14020069
Spacetime approach to force-free magnetospheres - Lecture 3

Ted Jacobson University of Maryland, College Park

February 26, 2014

PIRSA:14020157
13/14 PSI - Beyond the Standard Model - Lecture 6

Robert Mann University of Waterloo

February 26, 2014

PIRSA:14020058
Introduction to Quantum Field Theory for Cosmology - Lecture 13

Achim Kempf University of Waterloo

February 25, 2014

PIRSA:14020002
Numerical detection of symmetry protected and symmetry enriched topological phases

Frank Pollmann Max Planck Institute for Physics, Munich (Werner-Heisenberg-Institut)

February 25, 2014

PIRSA:14020140

Condensed Matter

13/14 PSI - Beyond the Standard Model - Lecture 7

Robert Mann University of Waterloo

February 27, 2014

PIRSA:14020059
Nonlocal cosmology

Richard Woodard University of Florida

February 27, 2014

PIRSA:14020137

General Relativity & Quantum Cosmology

I review a class of nonlocally modified gravity models which were proposed to explain the current phase of cosmic acceleration without dark energy. Among the topics considered are deriving causal and conserved field equations, adjusting the model to make it support a given expansion history, why these models do not require an elaborate screening mechanism to evade solar system tests, degrees of freedom and kinetic stability, and the negative verdict of structure formation. Although these simple models are not consistent with data on the growth of cosmic structures many of their features are likely to carry over to more complicated models which are in better agreement with the data.
13/14 PSI - Quantum Information Review - Lecture 9

Andrew Childs University of Waterloo

February 27, 2014

PIRSA:14020081
13/14 PSI - Quantum Gravity Review - Lecture 8

Bianca Dittrich Perimeter Institute for Theoretical Physics

February 27, 2014

PIRSA:14020070
À la recherche du temps perdu - Templeton Frontiers Colloquia

Flavio Mercati University of Naples Federico II

February 26, 2014

PIRSA:14020100

General Relativity & Quantum Cosmology

Augustine of Hippo declared he knew what time is until someone asked him. After 16 centuries we still largely ignore the true essence of time, but we made definite progress in studying its properties. The most striking, and somewhat intuitively (and tragically) obvious one is the irreversibility of its flow. And yet, our fundamental theories are time-reversal invariant, they do not distinguish between past and future. This is usually accounted for by assuming an immensely special initial condition of the Universe, dressed with statistical arguments. In this talk, I will show how an irreversible behaviour, and with it a growth of complexity and information, can emerge from time-reversal invariant laws, without assuming any special initial condition and without thermodynamical arguments. This phenomenon is present in General Relativity, our most advanced theory of the Universe. This irreversibility will also allow me to propose a solution of another puzzle associated with time, namely the incompatibility between the quantum and the general-relativistic notions of time.
13/14 PSI - Quantum Information Review - Lecture 8

Andrew Childs University of Waterloo

February 26, 2014

PIRSA:14020080
Spacetime approach to force-free magnetospheres - Lecture 4

Ted Jacobson University of Maryland, College Park

February 26, 2014

PIRSA:14020158
13/14 PSI - Quantum Gravity Review - Lecture 7

Bianca Dittrich Perimeter Institute for Theoretical Physics

February 26, 2014

PIRSA:14020069
Spacetime approach to force-free magnetospheres - Lecture 3

Ted Jacobson University of Maryland, College Park

February 26, 2014

PIRSA:14020157
13/14 PSI - Beyond the Standard Model - Lecture 6

Robert Mann University of Waterloo

February 26, 2014

PIRSA:14020058
Introduction to Quantum Field Theory for Cosmology - Lecture 13

Achim Kempf University of Waterloo

February 25, 2014

PIRSA:14020002
Numerical detection of symmetry protected and symmetry enriched topological phases

Frank Pollmann Max Planck Institute for Physics, Munich (Werner-Heisenberg-Institut)

February 25, 2014

PIRSA:14020140

Condensed Matter

A topological phase is a phase of matter which cannot be characterized by a local order parameter. We first introduce non-local order parameters that can detect symmetry protected topological (SPT) phases in 1D systems and then show how to generalize the idea to detect symmetry enriched topological (SET) phases in 2D. SET phases are new structures that occur in topologically ordered systems in the presence of symmetries. We introduce simple methods to detect the SET order directly from a complete set of topologically degenerate ground state wave functions. We first show how to directly determine the characteristic symmetry fractionalization of the quasiparticles from the reduced density matrix of the minimally entangled states. Second, we show how a simple generalization of a non-local order parameter can be measured to detect SETs. The usefulness of the proposed approached is demonstrated by examining two concrete model states which exhibit SET: (i) a spin-1 model on the honeycomb lattice and (ii) the resonating valence bond state on a kagome lattice. We conclude that the spin-1 model and the RVB state are in the same SET phases.

Title	Date	Collection	Type	Info
13/14 PSI - Beyond the Standard Model - Lecture 7	2014‑02‑27	13/14 PSI - Beyond the Standard Model	Course	View details
Nonlocal cosmology	2014‑02‑27	Quantum Gravity	Scientific Series	View details
13/14 PSI - Quantum Information Review - Lecture 9	2014‑02‑27	13/14 PSI - Quantum Information Review	Course	View details
13/14 PSI - Quantum Gravity Review - Lecture 8	2014‑02‑27	13/14 PSI - Quantum Gravity Review	Course	View details
À la recherche du temps perdu - Templeton Frontiers Colloquia	2014‑02‑26	Colloquium	Scientific Series	View details
13/14 PSI - Quantum Information Review - Lecture 8	2014‑02‑26	13/14 PSI - Quantum Information Review	Course	View details
Spacetime approach to force-free magnetospheres - Lecture 4	2014‑02‑26	Spacetime approach to force-free magnetospheres	Course	View details
13/14 PSI - Quantum Gravity Review - Lecture 7	2014‑02‑26	13/14 PSI - Quantum Gravity Review	Course	View details
Spacetime approach to force-free magnetospheres - Lecture 3	2014‑02‑26	Spacetime approach to force-free magnetospheres	Course	View details
13/14 PSI - Beyond the Standard Model - Lecture 6	2014‑02‑26	13/14 PSI - Beyond the Standard Model	Course	View details
Introduction to Quantum Field Theory for Cosmology - Lecture 13	2014‑02‑25	Quantum Field Theory for Cosmology - 2014	Course	View details
Numerical detection of symmetry protected and symmetry enriched topological phases	2014‑02‑25	Quantum Matter	Scientific Series	View details

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Format results

13/14 PSI - Beyond the Standard Model - Lecture 7

Nonlocal cosmology

13/14 PSI - Quantum Information Review - Lecture 9

13/14 PSI - Quantum Gravity Review - Lecture 8

À la recherche du temps perdu - Templeton Frontiers Colloquia

13/14 PSI - Quantum Information Review - Lecture 8

Spacetime approach to force-free magnetospheres - Lecture 4

13/14 PSI - Quantum Gravity Review - Lecture 7

Spacetime approach to force-free magnetospheres - Lecture 3

13/14 PSI - Beyond the Standard Model - Lecture 6

Introduction to Quantum Field Theory for Cosmology - Lecture 13

Numerical detection of symmetry protected and symmetry enriched topological phases

13/14 PSI - Beyond the Standard Model - Lecture 7

Nonlocal cosmology

13/14 PSI - Quantum Information Review - Lecture 9

13/14 PSI - Quantum Gravity Review - Lecture 8

À la recherche du temps perdu - Templeton Frontiers Colloquia

13/14 PSI - Quantum Information Review - Lecture 8

Spacetime approach to force-free magnetospheres - Lecture 4

13/14 PSI - Quantum Gravity Review - Lecture 7

Spacetime approach to force-free magnetospheres - Lecture 3

13/14 PSI - Beyond the Standard Model - Lecture 6

Introduction to Quantum Field Theory for Cosmology - Lecture 13

Numerical detection of symmetry protected and symmetry enriched topological phases