Talks

9133 - 9144 of 16889 Results

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
(Non)perturbative QCD and Jet Substructure

Jesse Thaler Massachusetts Institute of Technology (MIT)

October 14, 2014

PIRSA:14100046
Gravitational lensing of the CMB

Gilbert Holder University of Illinois Urbana-Champaign

October 14, 2014

PIRSA:14100084

Cosmology
14/15 PSI - Statistical Mechanics - Lecture 6

Anton Burkov University of Waterloo

October 14, 2014

PIRSA:14100092
14/15 PSI - Quantum Field Theory I (A) - Lecture 5

Tibra Ali Perimeter Institute for Theoretical Physics

Dan Wohns Perimeter Institute for Theoretical Physics

October 10, 2014

PIRSA:14100031
14/15 PSI - Conformal Field Theory - Lecture 5

Jaume Gomis Perimeter Institute for Theoretical Physics

October 10, 2014

PIRSA:14100012
14/15 PSI - Statistical Mechanics - Lecture 5

Anton Burkov University of Waterloo

October 10, 2014

PIRSA:14100088
14/15 PSI - Conformal Field Theory - Lecture 4

Jaume Gomis Perimeter Institute for Theoretical Physics

October 09, 2014

PIRSA:14100011

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.
(Non)perturbative QCD and Jet Substructure

Jesse Thaler Massachusetts Institute of Technology (MIT)

October 14, 2014

PIRSA:14100046

With the remarkable performance of the ATLAS and CMS detectors, jets at the LHC can now be characterized not just by their overall direction and energy but also by their substructure. At the same time, there has been substantial progress in predicting the properties of jets from first principles. In this talk, I highlight the ways that theoretical studies of jet substructure have enhanced our understanding of QCD, including examples that blur the boundary between perturbative and nonperturbative physics.
Gravitational lensing of the CMB

Gilbert Holder University of Illinois Urbana-Champaign

October 14, 2014

PIRSA:14100084

Cosmology

Gravitational lensing of the cosmic microwave background is emerging as a useful cosmological tool. Recent measurements have been made by several experiments (including the South Pole Telescope, which will be featured), with rapidly improving precision. These measurements can be used for many purposes, including studying the connection between dark matter and galaxies on large scales, measuring the clustering of matter at z~3, and improving the precision of possible measurements of gravitational radiation from inflation.
14/15 PSI - Statistical Mechanics - Lecture 6

Anton Burkov University of Waterloo

October 14, 2014

PIRSA:14100092
14/15 PSI - Quantum Field Theory I (A) - Lecture 5

Tibra Ali Perimeter Institute for Theoretical Physics

Dan Wohns Perimeter Institute for Theoretical Physics

October 10, 2014

PIRSA:14100031
14/15 PSI - Conformal Field Theory - Lecture 5

Jaume Gomis Perimeter Institute for Theoretical Physics

October 10, 2014

PIRSA:14100012
14/15 PSI - Statistical Mechanics - Lecture 5

Anton Burkov University of Waterloo

October 10, 2014

PIRSA:14100088
14/15 PSI - Conformal Field Theory - Lecture 4

Jaume Gomis Perimeter Institute for Theoretical Physics

October 09, 2014

PIRSA:14100011

Title	Date	Collection	Type	Info
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
(Non)perturbative QCD and Jet Substructure	2014‑10‑14	Particle Physics	Scientific Series	View details
Gravitational lensing of the CMB	2014‑10‑14	Cosmology and Gravitation	Scientific Series	View details
14/15 PSI - Statistical Mechanics - Lecture 6	2014‑10‑14	14/15 PSI - Statistical Mechanics	Course	View details
14/15 PSI - Quantum Field Theory I (A) - Lecture 5	2014‑10‑10	14/15 PSI - Quantum Field Theory	Course	View details
14/15 PSI - Conformal Field Theory - Lecture 5	2014‑10‑10	14/15 PSI - Conformal Field Theory	Course	View details
14/15 PSI - Statistical Mechanics - Lecture 5	2014‑10‑10	14/15 PSI - Statistical Mechanics	Course	View details
14/15 PSI - Conformal Field Theory - Lecture 4	2014‑10‑09	14/15 PSI - Conformal Field Theory	Course	View details

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