Talks

11245 - 11256 of 19958 Results

Maximal supergravity, holography and the Romans mass

Oscar Varela Harvard University

September 12, 2014

PIRSA:14090071

High Energy Physics
14/15 PSI Quantum Theory-5

Joseph Emerson Institute for Quantum Computing (IQC)

September 12, 2014

PIRSA:14090046
14/15 PSI - Relativity- Lecture 5

Neil Turok University of Edinburgh

September 12, 2014

PIRSA:14090011
Stripes and pairing in t-J and Hubbard models

Steven White University of California, Irvine

September 11, 2014

PIRSA:14090074

Condensed Matter
Force-Free Electrodynamics around Extreme Kerr Black Holes

Maria J. Rodriguez Utah State University

September 11, 2014

PIRSA:14090065

General Relativity & Quantum Cosmology
14/15 PSI Quantum Theory-4

Joseph Emerson Institute for Quantum Computing (IQC)

September 11, 2014

PIRSA:14090045
14/15 PSI - Relativity- Lecture 4

Neil Turok University of Edinburgh

September 11, 2014

PIRSA:14090010
An invariant of topologically ordered states under local unitary transformations

Jeongwan Haah Massachusetts Institute of Technology (MIT) - Department of Physics

September 10, 2014

PIRSA:14090030

Quantum Physics
Short-Range Entangled Phases and Topology

Anton Kapustin California Institute of Technology (Caltech) - Division of Physics Mathematics & Astronomy

September 10, 2014

PIRSA:14090002
14/15 PSI Quantum Theory-3

Joseph Emerson Institute for Quantum Computing (IQC)

September 10, 2014

PIRSA:14090044
14/15 PSI - Relativity- Lecture 3

Neil Turok University of Edinburgh

September 10, 2014

PIRSA:14090009
Many-Body Localization in translation invariant systems?

Francois Huveneers University of Paris-Saclay

September 09, 2014

PIRSA:14090027

Maximal supergravity, holography and the Romans mass

Oscar Varela Harvard University

September 12, 2014

PIRSA:14090071

High Energy Physics

At large N, an important sector of the ABJM field theory defined on a stack of N M2-branes can be described holographically by the D=4 N=8 SO(8)-gauged supergravity of de Wit and Nicolai. Since its inception, the latter has been tacitly assumed to be unique. Recently, however, a one-parameter family of SO(8) gaugings of N=8 supergravity has been discovered, the de Wit-Nicolai theory being just a member in this class. I will explain how this overlooked family of SO(8)-gauged supergravities is deeply related to electric/magnetic duality breaking in four dimensions. I will then discuss some predictions that can be made about the family of dual large-N field theories that these supergravities define, focusing on the structure of superconformal phases and the RG flows between them. I will finally argue that when the gauging is chosen to be related, but different, to the SO(8) one, the D=4 N=8 family arises as consistent truncation of massive IIA on the six-sphere, with the Romans mass identified as the electric/magnetic duality-breaking parameter.
14/15 PSI Quantum Theory-5

Joseph Emerson Institute for Quantum Computing (IQC)

September 12, 2014

PIRSA:14090046
14/15 PSI - Relativity- Lecture 5

Neil Turok University of Edinburgh

September 12, 2014

PIRSA:14090011
Stripes and pairing in t-J and Hubbard models

Steven White University of California, Irvine

September 11, 2014

PIRSA:14090074

Condensed Matter

This has been a leading question in condensed matter physics since the discovery of the cuprate superconductors. In this talk I will review some of the DMRG and tensor network results for the ground states of these models. A key question I'll address is the issue of stripes: are the ground states striped? Do stripes compete with or induce d-wave superconductivity? Another question I'll address is: how well does 2D DMRG do in comparison with iPEPS and quantum Monte Carlo. I will also show recent results for a standard 3-band Hubbard model for the cuprates. The asymmetry between hole and electron doped systems which is seen in the cuprates arises naturally from this model.
Force-Free Electrodynamics around Extreme Kerr Black Holes

Maria J. Rodriguez Utah State University

September 11, 2014

PIRSA:14090065

General Relativity & Quantum Cosmology

Plasma-filled magnetospheres can extract energy from a spinning black hole and provide the power source for a variety of observed astrophysical phenomena. These magnetospheres are described by the highly nonlinear equations of force-free electrodynamics, or FFE. Typically these equations can only be solved numerically. In this talk I will explain how to analytically obtain several infinite families of exact solutions of the full nonlinear FFE equations very near the horizon of a maximally spinning black hole, where the energy extraction takes place.
14/15 PSI Quantum Theory-4

Joseph Emerson Institute for Quantum Computing (IQC)

September 11, 2014

PIRSA:14090045
14/15 PSI - Relativity- Lecture 4

Neil Turok University of Edinburgh

September 11, 2014

PIRSA:14090010
An invariant of topologically ordered states under local unitary transformations

Jeongwan Haah Massachusetts Institute of Technology (MIT) - Department of Physics

September 10, 2014

PIRSA:14090030

Quantum Physics

For an anyon model in two spatial dimensions described by a modular tensor category, the topological S-matrix encodes the mutual braiding statistics, the quantum dimensions, and the fusion rules of anyons. It is nontrivial whether one can compute the topological S-matrix from a single ground state wave function. In this talk, I will show that, for a class of Hamiltonians, it is possible to define the S-matrix regardless of the degeneracy of the ground state. The definition manifests invariance of the S-matrix under local unitary transformations (quantum circuits). The defined S-matrix depends only on the ground state, in the sense that it can be computed by any Hamiltonian in the class of which the state is a ground state. This property, together with the local unitary invariance implies that any quantum circuit that connects two ground states of distinct topological S-matrices must have depth that is at least linear in the diameter of the system. A higher dimensional analog is straightforward. [arXiv:1407.2926]
Short-Range Entangled Phases and Topology

Anton Kapustin California Institute of Technology (Caltech) - Division of Physics Mathematics & Astronomy

September 10, 2014

PIRSA:14090002

Recently a new and rather unexpected connection between condensed matter physics and algebraic topology has been noted. Namely, it appears that phases of matter with an energy gap, no long-range entanglement, and fixed symmetry can be classified using cobordism theory. I will exhibit several examples of this connection and describe a possible explanation.
14/15 PSI Quantum Theory-3

Joseph Emerson Institute for Quantum Computing (IQC)

September 10, 2014

PIRSA:14090044
14/15 PSI - Relativity- Lecture 3

Neil Turok University of Edinburgh

September 10, 2014

PIRSA:14090009
Many-Body Localization in translation invariant systems?

Francois Huveneers University of Paris-Saclay

September 09, 2014

PIRSA:14090027

Roughly speaking, Many-Body Localization (MBL) refers to the state of a material that fails to thermalize. Though MBL has mostly been studied in quenched disordered systems, several authors have recently proposed that this phase could be realized in clean (translation invariant) systems too. In this talk, I will discuss this idea and ask to which extent an MBL phase can indeed be expected in systems without quenched disorder. Hopefully, the discussion shed also some light on the localization-delocalization transition for more generic many-body systems. From joint work with W. De Roeck (Leuven), M. Mueller (Trieste), M. Schiulaz (Trieste).

Title	Date	Collection	Type	Info
Maximal supergravity, holography and the Romans mass	2014‑09‑12	Quantum Fields and Strings	Scientific Series	View details
14/15 PSI Quantum Theory-5	2014‑09‑12	14/15 PSI - Quantum Theory	Course	View details
14/15 PSI - Relativity- Lecture 5	2014‑09‑12	14/15 PSI -Relativity	Course	View details
Stripes and pairing in t-J and Hubbard models	2014‑09‑11	Quantum Matter	Scientific Series	View details
Force-Free Electrodynamics around Extreme Kerr Black Holes	2014‑09‑11	Strong Gravity	Scientific Series	View details
14/15 PSI Quantum Theory-4	2014‑09‑11		Course	View details
14/15 PSI - Relativity- Lecture 4	2014‑09‑11	14/15 PSI -Relativity	Course	View details
An invariant of topologically ordered states under local unitary transformations	2014‑09‑10	Perimeter Institute Quantum Discussions	Scientific Series	View details
Short-Range Entangled Phases and Topology	2014‑09‑10	Colloquium	Scientific Series	View details
14/15 PSI Quantum Theory-3	2014‑09‑10	14/15 PSI - Quantum Theory	Course	View details
14/15 PSI - Relativity- Lecture 3	2014‑09‑10	14/15 PSI -Relativity	Course	View details
Many-Body Localization in translation invariant systems?	2014‑09‑09	Quantum Matter	Scientific Series	View details

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Format results

Maximal supergravity, holography and the Romans mass

14/15 PSI Quantum Theory-5

14/15 PSI - Relativity- Lecture 5

Stripes and pairing in t-J and Hubbard models

Force-Free Electrodynamics around Extreme Kerr Black Holes

14/15 PSI Quantum Theory-4

14/15 PSI - Relativity- Lecture 4

An invariant of topologically ordered states under local unitary transformations

Short-Range Entangled Phases and Topology

14/15 PSI Quantum Theory-3

14/15 PSI - Relativity- Lecture 3

Many-Body Localization in translation invariant systems?

Maximal supergravity, holography and the Romans mass

14/15 PSI Quantum Theory-5

14/15 PSI - Relativity- Lecture 5

Stripes and pairing in t-J and Hubbard models

Force-Free Electrodynamics around Extreme Kerr Black Holes

14/15 PSI Quantum Theory-4

14/15 PSI - Relativity- Lecture 4

An invariant of topologically ordered states under local unitary transformations

Short-Range Entangled Phases and Topology

14/15 PSI Quantum Theory-3

14/15 PSI - Relativity- Lecture 3

Many-Body Localization in translation invariant systems?