Search Talks

Search results

8989 - 9000 of 16752 Results

Superconformal Indices, AdS/CFT, and Cyclic Homologies

Richard Eager University of Tokyo
October 16, 2014

PIRSA:14100067
Quantum Fields and Strings
14/15 PSI - Statistical Mechanics - Lecture 8

Anton Burkov University of Waterloo

October 16, 2014

PIRSA:14100094
14/15 PSI - Conformal Field Theory - Lecture 7

Pedro Vieira Perimeter Institute for Theoretical Physics

October 15, 2014

PIRSA:14100017
14/15 PSI - Quantum Field Theory I (A) - Lecture 7
- Tibra Ali Perimeter Institute for Theoretical Physics
- Dan Wohns Perimeter Institute for Theoretical Physics
October 15, 2014

PIRSA:14100036
Quantum Fields and Strings at Finite Coupling

Pedro Vieira Perimeter Institute for Theoretical Physics

October 15, 2014

PIRSA:14100050
14/15 PSI - Statistical Mechanics - Lecture 7

Anton Burkov University of Waterloo

October 15, 2014

PIRSA:14100093
Entanglement Entropy and the Area Law - Lecture 2

Rafael Sorkin Perimeter Institute for Theoretical Physics

October 14, 2014

PIRSA:14100070
Bulk Entanglement Spectrum: From Topological States to Quantum Criticality

Timothy Hsieh Perimeter Institute for Theoretical Physics
October 14, 2014

PIRSA:14100075
Condensed Matter
14/15 PSI - Conformal Field Theory- Lecture 6

Pedro Vieira Perimeter Institute for Theoretical Physics

October 14, 2014

PIRSA:14100016
The Minimal Modal Interpretation of Quantum Theory
- David Kagan University of Massachusetts Dartmouth
- Jacob Barandes Harvard University
October 14, 2014

PIRSA:14100001
Quantum Foundations
14/15 PSI - Quantum Field Theory I (A) - Lecture 6
- Tibra Ali Perimeter Institute for Theoretical Physics
- Dan Wohns Perimeter Institute for Theoretical Physics
October 14, 2014

PIRSA:14100035
QQ-CHARACTERS, GAUGE THEORY and non-perturbative Dyson-Schwinger equations

Nikita Nekrasov Stony Brook University

October 14, 2014

PIRSA:14100066

Superconformal Indices, AdS/CFT, and Cyclic Homologies

Richard Eager University of Tokyo
October 16, 2014

PIRSA:14100067
Quantum Fields and Strings
We explain how to obtain the spectrum of operators with protected scaling dimensions in a four-dimensional superconformal field theory from cyclic homology. Additionally, we show that the superconformal index of a quiver gauge theory equals the Euler characteristic of the cyclic homology of the Ginzburg dg algebra associated to the quiver. For quiver gauge theories which are dual to type IIB string theory on the product of an arbitrary smooth Sasaki-Einstein manifold with five-dimensional AdS space, the index is calculated both from the gauge theory and gravity viewpoints. We find complete agreement. Finally we show how to match the spectrum of protected operators on a supergravity compactification involving generalized complex geometry.
14/15 PSI - Statistical Mechanics - Lecture 8

Anton Burkov University of Waterloo

October 16, 2014

PIRSA:14100094
14/15 PSI - Conformal Field Theory - Lecture 7

Pedro Vieira Perimeter Institute for Theoretical Physics

October 15, 2014

PIRSA:14100017
14/15 PSI - Quantum Field Theory I (A) - Lecture 7
- Tibra Ali Perimeter Institute for Theoretical Physics
- Dan Wohns Perimeter Institute for Theoretical Physics
October 15, 2014

PIRSA:14100036
Quantum Fields and Strings at Finite Coupling

Pedro Vieira Perimeter Institute for Theoretical Physics

October 15, 2014

PIRSA:14100050

Gauge theories lie at the heart of our understanding of three of the four known forces in nature: the electromagnetic, weak and strong forces. Moreover, our best understood non-perturbative definition of a theory of quantum gravity is also given by a gauge theory. Yet, despite their absolutely central role in physics, gauge theories are still far from being tamed with our current theoretical tools. In this colloquium we shall explore the realm of quantum fields and strings at finite coupling and survey some of the exciting recent developments which are improving this state of affairs. The main character in our incursions will be a most symmetric gauge theory known as N=4 super Yang-Mills theory, often referred to as the harmonic oscillator of the twenty first century or, as it was most recently coined, as the Darth Vader theory.
14/15 PSI - Statistical Mechanics - Lecture 7

Anton Burkov University of Waterloo

October 15, 2014

PIRSA:14100093
Entanglement Entropy and the Area Law - Lecture 2

Rafael Sorkin Perimeter Institute for Theoretical Physics

October 14, 2014

PIRSA:14100070
Bulk Entanglement Spectrum: From Topological States to Quantum Criticality

Timothy Hsieh Perimeter Institute for Theoretical Physics
October 14, 2014

PIRSA:14100075
Condensed Matter
A quantum phase transition is usually achieved by tuning physical parameters in a Hamiltonian at zero temperature. Here, we demonstrate that the ground state of a topological phase itself encodes critical properties of its transition to a trivial phase. To extract this information, we introduce a partition of the system into two subsystems both of which extend throughout the bulk in all directions. The resulting bulk entanglement spectrum (BES) has a low-lying part that resembles the excitation spectrum of a bulk Hamiltonian, which allows us to probe a topological phase transition from a single wavefunction by tuning either the geometry of the partition or the entanglement temperature. As an example, this remarkable correspondence between topological phase transition and entanglement criticality is rigorously established for integer quantum Hall states. We also implement BES using tensor networks, derive the universality classes of topological phase transitions from the spin-1 chain Haldane phase, and demonstrate that the AKLT wavefunction (and its generalizations) remarkably contains critical six-vertex (and in general eight-vertex) models within it.
14/15 PSI - Conformal Field Theory- Lecture 6

Pedro Vieira Perimeter Institute for Theoretical Physics

October 14, 2014

PIRSA:14100016
The Minimal Modal Interpretation of Quantum Theory
- David Kagan University of Massachusetts Dartmouth
- Jacob Barandes Harvard University
October 14, 2014

PIRSA:14100001
Quantum Foundations
A persistent mystery of quantum theory is whether it admits an interpretation that is realist, self-consistent, model-independent, and unextravagant in the sense of featuring neither multiple worlds nor pilot waves. In this talk, I will present a new interpretation of quantum theory -- called the minimal modal interpretation (MMI) -- that aims to meet these conditions while also hewing closely to the basic structure of the theory in its widely accepted form. The MMI asserts that quantum systems -- whether closed or open -- have actual states that evolve along kinematical trajectories through their state spaces, and that those trajectories are governed by specific (if approximate) dynamical rules determined by a general new class of conditional probabilities, and in a manner that differs significantly from the de Broglie-Bohm formulation. The MMI is axiomatically parsimonious, leaves the usual dynamical content of quantum theory essentially intact, and includes only metaphysical entities that are either already a standard part of quantum theory or that have counterparts in classical physics. I will also address a number of important issues and implicit assumptions in the foundations community that I believe merit reconsideration and re-evaluation going forward.
14/15 PSI - Quantum Field Theory I (A) - Lecture 6
- Tibra Ali Perimeter Institute for Theoretical Physics
- Dan Wohns Perimeter Institute for Theoretical Physics
October 14, 2014

PIRSA:14100035
QQ-CHARACTERS, GAUGE THEORY and non-perturbative Dyson-Schwinger equations

Nikita Nekrasov Stony Brook University

October 14, 2014

PIRSA:14100066

We report on recent advances in understanding the non-local symmetries of quantum field theory, notably gauge theory. The symmetries relate topologically distinct sectors of the field space. We study these symmetries in some detail in the context of the BPS/CFT correspondence. We also introduce a notion of qq-characters, which generalize the q-characters of quantum affine algebras, introduced by E. Frenkel and N. Reshetikhin, and conjecturally are related to the (q, t)-characters introduced by H. Nakajima. We show that the qq-characters can be used to derive an infinite set of Dyson-Schwinger type relations which imply that the supersymmetric partition functions of four dimensional gauge theory (with surface operators) obey BPZ and KZB-type equations.

Title	Date	Collection	Type	Info
Superconformal Indices, AdS/CFT, and Cyclic Homologies	2014‑10‑16	Quantum Fields and Strings	Scientific Series	View details
14/15 PSI - Statistical Mechanics - Lecture 8	2014‑10‑16	14/15 PSI - Statistical Mechanics	Course	View details
14/15 PSI - Conformal Field Theory - Lecture 7	2014‑10‑15	14/15 PSI - Conformal Field Theory	Course	View details
14/15 PSI - Quantum Field Theory I (A) - Lecture 7	2014‑10‑15	14/15 PSI - Quantum Field Theory	Course	View details
Quantum Fields and Strings at Finite Coupling	2014‑10‑15	Colloquium	Scientific Series	View details
14/15 PSI - Statistical Mechanics - Lecture 7	2014‑10‑15	14/15 PSI - Statistical Mechanics	Course	View details
Entanglement Entropy and the Area Law - Lecture 2	2014‑10‑14	Entanglement Entropy and the Area Law	Course	View details
Bulk Entanglement Spectrum: From Topological States to Quantum Criticality	2014‑10‑14	Quantum Matter	Scientific Series	View details
14/15 PSI - Conformal Field Theory- Lecture 6	2014‑10‑14	14/15 PSI - Conformal Field Theory	Course	View details
The Minimal Modal Interpretation of Quantum Theory	2014‑10‑14	Quantum Foundations	Scientific Series	View details
14/15 PSI - Quantum Field Theory I (A) - Lecture 6	2014‑10‑14	14/15 PSI - Quantum Field Theory	Course	View details
QQ-CHARACTERS, GAUGE THEORY and non-perturbative Dyson-Schwinger equations	2014‑10‑14	Quantum Fields and Strings	Scientific Series	View details

Search Talks

Format results