Talks

11725 - 11736 of 19959 Results

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 5

Robert Mann University of Waterloo

February 25, 2014

PIRSA:14020057
Spacetime approach to force-free magnetospheres - Lecture 2

Ted Jacobson University of Maryland, College Park

February 25, 2014

PIRSA:14020155
13/14 PSI - Quantum Information Review - Lecture 7

Andrew Childs University of Waterloo

February 25, 2014

PIRSA:14020079
Large Tensor-to-Scalar Ratio in Small-Field Inflation

Takeshi Kobayashi SISSA International School for Advanced Studies

February 25, 2014

PIRSA:14020152

High Energy Physics

Astrophysics

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.
13/14 PSI - Beyond the Standard Model - Lecture 5

Robert Mann University of Waterloo

February 25, 2014

PIRSA:14020057
Spacetime approach to force-free magnetospheres - Lecture 2

Ted Jacobson University of Maryland, College Park

February 25, 2014

PIRSA:14020155
13/14 PSI - Quantum Information Review - Lecture 7

Andrew Childs University of Waterloo

February 25, 2014

PIRSA:14020079
Large Tensor-to-Scalar Ratio in Small-Field Inflation

Takeshi Kobayashi SISSA International School for Advanced Studies

February 25, 2014

PIRSA:14020152

High Energy Physics

Astrophysics

The production of gravitational waves from cosmic inflation > is normally bounded by the inflaton field excursion. This relation, > which is often referred to as the Lyth bound, claims that > observationally large gravitational waves are produced only if the > inflaton has a super-Planckian field range. In this talk I will point > out that this general belief is not necessarily true when there are > additional light fields producing density perturbations. Perturbations > seeded by the inflaton can be suppressed under such situations, thus > allow large gravitational waves to be produced even from small-field (i.e. > sub-Planckian) inflation. I will also show that the field bound is > taken over by the light field when the inflaton-induced perturbations > are suppressed, thus present a generalized form of the Lyth bound that > applies to the total field space. The calculations are rather simple, > so I will explain my work on a blackboard.

Title	Date	Collection	Type	Info
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
13/14 PSI - Beyond the Standard Model - Lecture 5	2014‑02‑25	13/14 PSI - Beyond the Standard Model	Course	View details
Spacetime approach to force-free magnetospheres - Lecture 2	2014‑02‑25	Spacetime approach to force-free magnetospheres	Course	View details
13/14 PSI - Quantum Information Review - Lecture 7	2014‑02‑25	13/14 PSI - Quantum Information Review	Course	View details
Large Tensor-to-Scalar Ratio in Small-Field Inflation	2014‑02‑25	Particle Physics	Scientific Series	View details

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Format results

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 5

Spacetime approach to force-free magnetospheres - Lecture 2

13/14 PSI - Quantum Information Review - Lecture 7

Large Tensor-to-Scalar Ratio in Small-Field Inflation

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 5

Spacetime approach to force-free magnetospheres - Lecture 2

13/14 PSI - Quantum Information Review - Lecture 7

Large Tensor-to-Scalar Ratio in Small-Field Inflation