Talks

9085 - 9096 of 16765 Results

14/15 PSI - Relativity- Lecture 7

Neil Turok University of Edinburgh

September 16, 2014

PIRSA:14090017
14/15 PSI Quantum Theory-6

Joseph Emerson Institute for Quantum Computing (IQC)

September 15, 2014

PIRSA:14090049
14/15 PSI - Relativity- Lecture 6

Neil Turok University of Edinburgh

September 15, 2014

PIRSA:14090016
Maximal supergravity, holography and the Romans mass

Oscar Varela Harvard University

September 12, 2014

PIRSA:14090071

Quantum Fields and Strings
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

Strong Gravity
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 Information
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 - Relativity- Lecture 7

Neil Turok University of Edinburgh

September 16, 2014

PIRSA:14090017
14/15 PSI Quantum Theory-6

Joseph Emerson Institute for Quantum Computing (IQC)

September 15, 2014

PIRSA:14090049
14/15 PSI - Relativity- Lecture 6

Neil Turok University of Edinburgh

September 15, 2014

PIRSA:14090016
Maximal supergravity, holography and the Romans mass

Oscar Varela Harvard University

September 12, 2014

PIRSA:14090071

Quantum Fields and Strings

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

Strong Gravity

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 Information

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.

Title	Date	Collection	Type	Info
14/15 PSI - Relativity- Lecture 7	2014‑09‑16	14/15 PSI -Relativity	Course	View details
14/15 PSI Quantum Theory-6	2014‑09‑15	14/15 PSI - Quantum Theory	Course	View details
14/15 PSI - Relativity- Lecture 6	2014‑09‑15	14/15 PSI -Relativity	Course	View details
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

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