Talks

10921 - 10932 of 19186 Results

A one-dimensional action for simplicial gravity in three dimensions

Wolfgang Wieland University of Erlangen-Nuremberg

March 06, 2014

PIRSA:14030088

General Relativity & Quantum Cosmology
Sequestering Lorentz violation in the Lifshitz sector

Maxim Pospelov University of Minnesota

March 06, 2014

PIRSA:14030092

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

Bianca Dittrich Perimeter Institute for Theoretical Physics

March 06, 2014

PIRSA:14030020
The Unreasonable Effectiveness Of Quantum Physics in Modern Mathematics

Robbert Dijkgraaf Institute for Advanced Study (IAS)

March 05, 2014

PIRSA:14030094
The Unreasonable Effectiveness Of Quantum Physics in Modern Mathematics

Robbert Dijkgraaf Institute for Advanced Study (IAS)

March 05, 2014

PIRSA:14030083

Mathematical Physics
13/14 PSI - Quantum Information Review - Lecture 13

Andrew Childs University of Waterloo

March 05, 2014

PIRSA:14030026
Spacetime approach to force-free magnetospheres - Lecture 8

Ted Jacobson University of Maryland, College Park

March 05, 2014

PIRSA:14030103
13/14 PSI - Quantum Gravity Review - Lecture 12

Bianca Dittrich Perimeter Institute for Theoretical Physics

March 05, 2014

PIRSA:14030019
Spacetime approach to force-free magnetospheres - Lecture 7

Ted Jacobson University of Maryland, College Park

March 05, 2014

PIRSA:14030102
13/14 PSI - Beyond the Standard Model - Lecture 11

Robert Mann University of Waterloo

March 05, 2014

PIRSA:14030012
Introduction to Quantum Field Theory for Cosmology - Lecture 15

Achim Kempf University of Waterloo

March 04, 2014

PIRSA:14020003
13/14 PSI - Beyond the Standard Model - Lecture 10

Robert Mann University of Waterloo

March 04, 2014

PIRSA:14030011

A one-dimensional action for simplicial gravity in three dimensions

Wolfgang Wieland University of Erlangen-Nuremberg

March 06, 2014

PIRSA:14030088

General Relativity & Quantum Cosmology

Loop quantum gravity has a spinorial representation. Spinors simplify the symplectic structure of the theory, but can they also teach us something about the dynamics? We study this question in three dimensions, and derive the Ponzano–-Regge model from a spinorial action. Our construction starts from the first-order Palatini formalism, and gives the discretised action in the spinorial representation. A one-dimensional refinement limit brings us back to a continuum theory. The three-dimensional action turns into a line integral over the edges of the discretisation. We compute the gauge-fixed path integral for a generic simplicial discretisation. The resulting amplitudes reproduce the Ponzano–-Regge model.
Sequestering Lorentz violation in the Lifshitz sector

Maxim Pospelov University of Minnesota

March 06, 2014

PIRSA:14030092

General Relativity & Quantum Cosmology

Horava's proposal to use Lifshitz propagators for gravitons above certain energy scales may provide a viable theory of quantum gravity without further need of UV completion. In my talk, I will address the question of whether the complete lack of Lorentz invariance above a certain energy scale is a big problem for any realistic construction. I will argue that it is not, provided that the onset of Lifshitz scaling for gravitons occurs at momentum scale much lower than the Planck mass. I will also discuss consequences of combining Lifshitz gravity and supersymmetric matter sector.
13/14 PSI - Quantum Gravity Review - Lecture 13

Bianca Dittrich Perimeter Institute for Theoretical Physics

March 06, 2014

PIRSA:14030020
The Unreasonable Effectiveness Of Quantum Physics in Modern Mathematics

Robbert Dijkgraaf Institute for Advanced Study (IAS)

March 05, 2014

PIRSA:14030094

Mathematics has proven to be "unreasonably effective" in understanding nature. The fundamental laws of physics can be captured in beautiful formulae. In this lecture I want to argue for the reverse effect: Nature is an important source of inspiration for mathematics, even of the purest kind. In recent years ideas from quantum field theory, elementary particles physics and string theory have completely transformed mathematics, leading to solutions of deep problems, suggesting new invariants in geometry and topology, and, perhaps most importantly, putting modern mathematical ideas in a `natural’ context.
The Unreasonable Effectiveness Of Quantum Physics in Modern Mathematics

Robbert Dijkgraaf Institute for Advanced Study (IAS)

March 05, 2014

PIRSA:14030083

Mathematical Physics

Mathematics has proven to be "unreasonably effective" in understanding nature. The fundamental laws of physics can be captured in beautiful formulae. In this lecture I want to argue for the reverse effect: Nature is an important source of inspiration for mathematics, even of the purest kind. In recent years ideas from quantum field theory, elementary particles physics and string theory have completely transformed mathematics, leading to solutions of deep problems, suggesting new invariants in geometry and topology, and, perhaps most importantly, putting modern mathematical ideas in a `natural’ context.
13/14 PSI - Quantum Information Review - Lecture 13

Andrew Childs University of Waterloo

March 05, 2014

PIRSA:14030026
Spacetime approach to force-free magnetospheres - Lecture 8

Ted Jacobson University of Maryland, College Park

March 05, 2014

PIRSA:14030103
13/14 PSI - Quantum Gravity Review - Lecture 12

Bianca Dittrich Perimeter Institute for Theoretical Physics

March 05, 2014

PIRSA:14030019
Spacetime approach to force-free magnetospheres - Lecture 7

Ted Jacobson University of Maryland, College Park

March 05, 2014

PIRSA:14030102
13/14 PSI - Beyond the Standard Model - Lecture 11

Robert Mann University of Waterloo

March 05, 2014

PIRSA:14030012
Introduction to Quantum Field Theory for Cosmology - Lecture 15

Achim Kempf University of Waterloo

March 04, 2014

PIRSA:14020003
13/14 PSI - Beyond the Standard Model - Lecture 10

Robert Mann University of Waterloo

March 04, 2014

PIRSA:14030011

Title	Date	Collection	Type	Info
A one-dimensional action for simplicial gravity in three dimensions	2014‑03‑06	Quantum Gravity	Scientific Series	View details
Sequestering Lorentz violation in the Lifshitz sector	2014‑03‑06	Strong Gravity	Scientific Series	View details
13/14 PSI - Quantum Gravity Review - Lecture 13	2014‑03‑06	13/14 PSI - Quantum Gravity Review	Course	View details
The Unreasonable Effectiveness Of Quantum Physics in Modern Mathematics	2014‑03‑05	Public Lecture Series	Public Lectures	View details
The Unreasonable Effectiveness Of Quantum Physics in Modern Mathematics	2014‑03‑05	Colloquium	Scientific Series	View details
13/14 PSI - Quantum Information Review - Lecture 13	2014‑03‑05	13/14 PSI - Quantum Information Review	Course	View details
Spacetime approach to force-free magnetospheres - Lecture 8	2014‑03‑05	Spacetime approach to force-free magnetospheres	Course	View details
13/14 PSI - Quantum Gravity Review - Lecture 12	2014‑03‑05	13/14 PSI - Quantum Gravity Review	Course	View details
Spacetime approach to force-free magnetospheres - Lecture 7	2014‑03‑05	Spacetime approach to force-free magnetospheres	Course	View details
13/14 PSI - Beyond the Standard Model - Lecture 11	2014‑03‑05	13/14 PSI - Beyond the Standard Model	Course	View details
Introduction to Quantum Field Theory for Cosmology - Lecture 15	2014‑03‑04	Quantum Field Theory for Cosmology - 2014	Course	View details
13/14 PSI - Beyond the Standard Model - Lecture 10	2014‑03‑04	13/14 PSI - Beyond the Standard Model	Course	View details

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Format results

A one-dimensional action for simplicial gravity in three dimensions

Sequestering Lorentz violation in the Lifshitz sector

13/14 PSI - Quantum Gravity Review - Lecture 13

The Unreasonable Effectiveness Of Quantum Physics in Modern Mathematics

The Unreasonable Effectiveness Of Quantum Physics in Modern Mathematics

13/14 PSI - Quantum Information Review - Lecture 13

Spacetime approach to force-free magnetospheres - Lecture 8

13/14 PSI - Quantum Gravity Review - Lecture 12

Spacetime approach to force-free magnetospheres - Lecture 7

13/14 PSI - Beyond the Standard Model - Lecture 11

Introduction to Quantum Field Theory for Cosmology - Lecture 15

13/14 PSI - Beyond the Standard Model - Lecture 10

A one-dimensional action for simplicial gravity in three dimensions

Sequestering Lorentz violation in the Lifshitz sector

13/14 PSI - Quantum Gravity Review - Lecture 13

The Unreasonable Effectiveness Of Quantum Physics in Modern Mathematics

The Unreasonable Effectiveness Of Quantum Physics in Modern Mathematics

13/14 PSI - Quantum Information Review - Lecture 13

Spacetime approach to force-free magnetospheres - Lecture 8

13/14 PSI - Quantum Gravity Review - Lecture 12

Spacetime approach to force-free magnetospheres - Lecture 7

13/14 PSI - Beyond the Standard Model - Lecture 11

Introduction to Quantum Field Theory for Cosmology - Lecture 15

13/14 PSI - Beyond the Standard Model - Lecture 10