Talks

11389 - 11400 of 19186 Results

13/14 PSI - Quantum Field Theory I - Lecture 5

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 11, 2013

PIRSA:13100024
13/14 PSI - Statistical Mechanics - Lecture 5

Anton Burkov University of Waterloo

October 11, 2013

PIRSA:13100043
General Relativity for Cosmology - Lecture 6

Achim Kempf University of Waterloo

October 10, 2013

PIRSA:13100104
General Relativity for Cosmology - Lecture 5

Achim Kempf University of Waterloo

October 10, 2013

PIRSA:13100007
Fractional solitons on the edge of the Fractional Quantum Hall states

Paul Wiegmann University of Chicago - James Franck Institute

October 10, 2013

PIRSA:13100073

Condensed Matter
13/14 PSI - Quantum Field Theory I - Lecture 4

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 10, 2013

PIRSA:13100023
Superselection Sectors in AdS/CFT - Joint Quantum Gravity and String Theory Seminar

Aron Wall University of Cambridge

October 10, 2013

PIRSA:13100066

General Relativity & Quantum Cosmology
Plasma without Plasma: Exploring Force-Free Magnetospheres

Sam Gralla University of Arizona

October 10, 2013

PIRSA:13100078

General Relativity & Quantum Cosmology
13/14 PSI - Statistical Mechanics - Lecture 4

Anton Burkov University of Waterloo

October 10, 2013

PIRSA:13100042
Einstein and the Fugu

Andrew Waldron University of California, Davis

October 10, 2013

PIRSA:13100101

Astrophysics
13/14 PSI - Quantum Field Theory I - Lecture 3

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 09, 2013

PIRSA:13100022
From Supersolidity to Giant Plasticity: Defects in Quantum Crystals

John Beamish University of Alberta

October 09, 2013

PIRSA:13100065

Condensed Matter

13/14 PSI - Quantum Field Theory I - Lecture 5

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 11, 2013

PIRSA:13100024
13/14 PSI - Statistical Mechanics - Lecture 5

Anton Burkov University of Waterloo

October 11, 2013

PIRSA:13100043
General Relativity for Cosmology - Lecture 6

Achim Kempf University of Waterloo

October 10, 2013

PIRSA:13100104
General Relativity for Cosmology - Lecture 5

Achim Kempf University of Waterloo

October 10, 2013

PIRSA:13100007
Fractional solitons on the edge of the Fractional Quantum Hall states

Paul Wiegmann University of Chicago - James Franck Institute

October 10, 2013

PIRSA:13100073

Condensed Matter

We argue that dynamics of gapless Fractional Quantum Hall Edge states is essentially non-linear and that it features fractionally quantized solitons propagating along the edge. Observation of solitons would be a direct evidence of fractional charges. We show that the non-linear dynamics of the Laughlin's FQH state is governed by the quantum Benjamin-Ono equation.
13/14 PSI - Quantum Field Theory I - Lecture 4

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 10, 2013

PIRSA:13100023
Superselection Sectors in AdS/CFT - Joint Quantum Gravity and String Theory Seminar

Aron Wall University of Cambridge

October 10, 2013

PIRSA:13100066

General Relativity & Quantum Cosmology

AdS/CFT is a duality relating the degrees of freedom in a D dimensional bulk gravity theory to a (D-1) dimensional theory living on the boundary. I will argue that in fact the boundary theory contains only a subset of the bulk observables. For each state of the boundary theory, there are multiple bulk states dual to it, which can be operationally distinguished by observers who fall across event horizons. Based on arXiv:1210.3590.
Plasma without Plasma: Exploring Force-Free Magnetospheres

Sam Gralla University of Arizona

October 10, 2013

PIRSA:13100078

General Relativity & Quantum Cosmology

Pulsars have enormous magnetic fields whose energy density dwarfs the rest mass density of their plasma magnetosphere. In this regime of a plasma, the particles drop out of the description, leaving a set of equations for the electromagnetic field alone. This non-linear, deterministic system is known as force-free electrodynamics, and turns out to have some beautiful and bizarre features. I will give a pedagogical introduction to these equations and their role in astrophysics and then discuss our recent contributions. We have taken a geometric viewpoint, using the null structure of spacetime to unify previous exact solutions and discover new ones. We have found non-stationary, non-axisymmetric solutions that describe the outer magnetosphere of pulsars, including those that are accelerated or torqued. We have derived the standard cartoon of the aligned pulsar magnetosphere from an explicit, minimal set of assumptions. Time permitting, I will also discuss some properties of black hole magnetospheres: Blandford-Znajek energy extraction, non-scattering force-free waves, and the no-ingrown-hair theorem.
13/14 PSI - Statistical Mechanics - Lecture 4

Anton Burkov University of Waterloo

October 10, 2013

PIRSA:13100042
Einstein and the Fugu

Andrew Waldron University of California, Davis

October 10, 2013

PIRSA:13100101

Astrophysics
13/14 PSI - Quantum Field Theory I - Lecture 3

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 09, 2013

PIRSA:13100022
From Supersolidity to Giant Plasticity: Defects in Quantum Crystals

John Beamish University of Alberta

October 09, 2013

PIRSA:13100065

Condensed Matter

In 2004, Kim and Chan reported torsional oscillator experiments on 4He crystals which showed evidence of “non-classical rotational inertia”, the mass decoupling expected for a long-sought “supersolid” state. It soon became clear that this behavior is not a property of perfect crystals – defects are involved. In 2007, we made elastic measurements which showed, to our surprise, that the shear modulus of solid 4He increases dramatically below 0.2 K, with the same dependence on temperature, amplitude and 3He impurity concentration as the torsional oscillator anomaly. These shear modulus changes are due to dislocations and their interactions with impurities and vacancies. Our experiments raised an obvious question – could the torsional oscillator behavior be an artifact of the elastic changes, rather than evidence of supersolidity? During the past two years it has become clear that the answer is “yes” and interest has focused on the properties of dislocations in a quantum solid like 4He. By growing high quality single crystals in optical cells, we have now been able to explore the behavior of dislocations in 4He in unprecedented detail. In some crystals the dislocations reduce the shear modulus by more than 80%, an extraordinary effect we describe as “giant plasticity”. Solid helium has proved to be an ideal system in which to do materials science, as well as to address fundamental questions about quantum solids.

Title	Date	Collection	Type	Info
13/14 PSI - Quantum Field Theory I - Lecture 5	2013‑10‑11	13/14 PSI - Quantum Field Theory I	Course	View details
13/14 PSI - Statistical Mechanics - Lecture 5	2013‑10‑11	13/14 PSI - Statistical Mechanics	Course	View details
General Relativity for Cosmology - Lecture 6	2013‑10‑10	General Relativity for Cosmology - 2013	Course	View details
General Relativity for Cosmology - Lecture 5	2013‑10‑10	General Relativity for Cosmology - 2013	Course	View details
Fractional solitons on the edge of the Fractional Quantum Hall states	2013‑10‑10	Quantum Matter	Scientific Series	View details
13/14 PSI - Quantum Field Theory I - Lecture 4	2013‑10‑10	13/14 PSI - Quantum Field Theory I	Course	View details
Superselection Sectors in AdS/CFT - Joint Quantum Gravity and String Theory Seminar	2013‑10‑10	Quantum Gravity	Scientific Series	View details
Plasma without Plasma: Exploring Force-Free Magnetospheres	2013‑10‑10	Strong Gravity	Scientific Series	View details
13/14 PSI - Statistical Mechanics - Lecture 4	2013‑10‑10	13/14 PSI - Statistical Mechanics	Course	View details
Einstein and the Fugu	2013‑10‑10	Cosmology and Gravitation	Scientific Series	View details
13/14 PSI - Quantum Field Theory I - Lecture 3	2013‑10‑09	13/14 PSI - Quantum Field Theory I	Course	View details
From Supersolidity to Giant Plasticity: Defects in Quantum Crystals	2013‑10‑09	Colloquium	Scientific Series	View details

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Format results

13/14 PSI - Quantum Field Theory I - Lecture 5

13/14 PSI - Statistical Mechanics - Lecture 5

General Relativity for Cosmology - Lecture 6

General Relativity for Cosmology - Lecture 5

Fractional solitons on the edge of the Fractional Quantum Hall states

13/14 PSI - Quantum Field Theory I - Lecture 4

Superselection Sectors in AdS/CFT - Joint Quantum Gravity and String Theory Seminar

Plasma without Plasma: Exploring Force-Free Magnetospheres

13/14 PSI - Statistical Mechanics - Lecture 4

Einstein and the Fugu

13/14 PSI - Quantum Field Theory I - Lecture 3

From Supersolidity to Giant Plasticity: Defects in Quantum Crystals

13/14 PSI - Quantum Field Theory I - Lecture 5

13/14 PSI - Statistical Mechanics - Lecture 5

General Relativity for Cosmology - Lecture 6

General Relativity for Cosmology - Lecture 5

Fractional solitons on the edge of the Fractional Quantum Hall states

13/14 PSI - Quantum Field Theory I - Lecture 4

Superselection Sectors in AdS/CFT - Joint Quantum Gravity and String Theory Seminar

Plasma without Plasma: Exploring Force-Free Magnetospheres

13/14 PSI - Statistical Mechanics - Lecture 4

Einstein and the Fugu

13/14 PSI - Quantum Field Theory I - Lecture 3

From Supersolidity to Giant Plasticity: Defects in Quantum Crystals