Talks

11941 - 11952 of 19958 Results

LHC Beam Instrumentation: Beam Loss and Tune Measurements (3/3)

Jones, Rhodri

December 31, 2013

oai:cds.cern.ch:1969913

Physics
Game Theory (2/2)

Koutsoupias, Elias

December 31, 2013

oai:cds.cern.ch:1702638

Physics
Black Holes from Particle Physics Perspective (2/2)

Dvali, Georgi

December 31, 2013

oai:cds.cern.ch:1972456

Physics
The Upgrade Programme of the LHC Detectors (2/3)

Riegler, Werner

December 31, 2013

oai:cds.cern.ch:1646417

Physics
Scale-free primordial cosmology

Anna Ijjas Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)

December 19, 2013

PIRSA:13120063

Astrophysics
The Bose-Hubbard model is QMA-complete

David Gosset Institute for Quantum Computing (IQC)

December 18, 2013

PIRSA:13120067

Quantum Physics
(0,4) sigma models and K3

Sarah Harrison Stanford University

December 18, 2013

PIRSA:13120071

High Energy Physics
A lattice non-perturbative definition of chiral fermion/gauge theory from Topological Order

Juven Wang Harvard University

December 13, 2013

PIRSA:13120069

Condensed Matter
Integrability (and Near Integrability) in Matrix-valued Field Theories

Axel Cortes Cubero City University of New York

December 13, 2013

PIRSA:13120068

High Energy Physics
Curvature in terms of entanglement

Achim Kempf University of Waterloo

December 12, 2013

PIRSA:13120064

General Relativity & Quantum Cosmology
holographic path to the turbulent side of gravity

Adam Brown Stanford University

Stephen Green University of Nottingham

December 12, 2013

PIRSA:13120066

Astrophysics
Partially Massless Gravity

December 11, 2013

PIRSA:13120005

Astrophysics

LHC Beam Instrumentation: Beam Loss and Tune Measurements (3/3)

Jones, Rhodri

December 31, 2013

oai:cds.cern.ch:1969913

Physics
Game Theory (2/2)

Koutsoupias, Elias

December 31, 2013

oai:cds.cern.ch:1702638

Physics
Black Holes from Particle Physics Perspective (2/2)

Dvali, Georgi

December 31, 2013

oai:cds.cern.ch:1972456

Physics
The Upgrade Programme of the LHC Detectors (2/3)

Riegler, Werner

December 31, 2013

oai:cds.cern.ch:1646417

Physics
Scale-free primordial cosmology

Anna Ijjas Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)

December 19, 2013

PIRSA:13120063

Astrophysics

The large-scale structure of the universe suggests that the physics underlying its early evolution is scale-free. In this talk, using a hydrodynamic approach, I will discuss how the scale-free principle restores predictive power and makes it possible to evaluate inflationary models and to compare them with alternative cosmologies.
The Bose-Hubbard model is QMA-complete

David Gosset Institute for Quantum Computing (IQC)

December 18, 2013

PIRSA:13120067

Quantum Physics

The Bose-Hubbard model is a system of interacting bosons that live on the vertices of a graph. The particles can move between adjacent vertices and experience a repulsive on-site interaction. The Hamiltonian is determined by a choice of graph that specifies the geometry in which the particles move and interact. We prove that approximating the ground energy of the Bose-Hubbard model on a graph at fixed particle number is QMA-complete. In our QMA-hardness proof, we encode the history of an n-qubit computation in the subspace with at most one particle per site (i.e., hard-core bosons). This feature, along with the well-known mapping between hard-core bosons and spin systems, lets us prove a related result for a class of 2-local Hamiltonians defined by graphs that generalizes the XY model. By avoiding the use of perturbation theory in our analysis, we circumvent the need to multiply terms in the Hamiltonian by large coefficients. This is joint work with Andrew Childs and Zak Webb.
(0,4) sigma models and K3

Sarah Harrison Stanford University

December 18, 2013

PIRSA:13120071

High Energy Physics

TBA
A lattice non-perturbative definition of chiral fermion/gauge theory from Topological Order

Juven Wang Harvard University

December 13, 2013

PIRSA:13120069

Condensed Matter

A non-perturbative definition of anomaly-free chiral fermions and bosons in 1+1D spacetime as finite quantum systems on 1D lattice is proposed. In particular, any 1+1D anomaly-free chiral matter theory can be defined as finite quantum systems on 1D lattice with on-site symmetry, if we include strong interactions between matter fields. Our approach provides another way, apart from Ginsparg-Wilson fermions approach, to avoid the fermion-doubling challenge. In general, using the defining connection between gauge anomalies and the symmetry-protected topological orders, we propose that any truly anomaly-free chiral gauge theory can be non-perturbatively defined by putting it on a lattice in the same dimension. As an additional remark, we conjecture/prove the equivalence relation between 't Hooft anomaly matching conditions and the boundary fully gapping rules.
Integrability (and Near Integrability) in Matrix-valued Field Theories

Axel Cortes Cubero City University of New York

December 13, 2013

PIRSA:13120068

High Energy Physics

The principal chiral sigma model (PCSM) in 1+1 dimensions is asymptotically free and has as SU(N)-valued field with massive excitations. We have found all the exact form factors and two-point function of the Noether-current operators at large N using the integrable bootstrap program. At finite N, only the first non-trivial form factors are found, which give a good long distance approximation for the two-point function. We show how to use these new exact results to study non-integrable deformations. One example is the PCSM coupled to a Yang-Mills field. One can approximate the spectrum of the meson-like bound states using our form factors. We also examine an anisotropic version of (2+1)-dimensional Yang-Mills theory, which can be interpreted as an array of coupled PCSM’s.
Curvature in terms of entanglement

Achim Kempf University of Waterloo

December 12, 2013

PIRSA:13120064

General Relativity & Quantum Cosmology

The entanglement of the quantum field theoretic vacuum state is affected by curvature. I ask if or under which conditions the curvature of spacetime can be expressed entirely in terms of the spatial entanglement structure of the vacuum. This would open up the prospect that general relativity could be formulated in quantum theoretic terms, which should then be helpful for studies in quantum gravity.
holographic path to the turbulent side of gravity

Adam Brown Stanford University

Stephen Green University of Nottingham

December 12, 2013

PIRSA:13120066

Astrophysics

We study the dynamics of a 2+1 dimensional relativistic viscous conformal fluid in Minkowski spacetime. Such fluid solutions arise as duals, under the "gravity/fluid correspondence", to 3+1 dimensional asymptotically anti-de Sitter (AAdS) black brane solutions to the Einstein equation. We examine stability properties of shear flows, which correspond to hydrodynamic quasinormal modes of the black brane. We find that, for sufficiently high Reynolds number, the solution undergoes an inverse turbulent cascade to long wavelength modes. We then map this fluid solution, via the gravity/fluid duality, into a bulk metric. This suggests a new and interesting feature of the behavior of perturbed AAdS black holes and black branes, which is not readily captured by a standard quasinormal mode analysis. Namely, for sufficiently large perturbed black objects (with long-lived quasinormal modes), nonlinear effects transfer energy from short to long wavelength modes via a turbulent cascade within the metric perturbation. As long wavelength modes have slower decay, this lengthens the overall lifetime of the perturbation. We also discuss various implications of this behavior, including expectations for higher dimensions, and the possibility of predicting turbulence in more general gravitational scenarios."
Partially Massless Gravity

December 11, 2013

PIRSA:13120005

Astrophysics

On de Sitter space, there exists a special value for the mass of a graviton for which the linear theory propagates 4 rather than 5 degrees of freedom. If a fully non-linear version of the theory exists and can be coupled to known matter, it would have interesting properties and could solve the cosmological constant problem. I will describe evidence for and obstructions to the existence of such a theory.

Title	Speaker(s)	Date	Collection	Type	Info
LHC Beam Instrumentation: Beam Loss and Tune Measurements (3/3)	Jones, Rhodri	2013‑12‑31	Academic Training Lectures		View details
Game Theory (2/2)	Koutsoupias, Elias	2013‑12‑31	Academic Training Lectures		View details
Black Holes from Particle Physics Perspective (2/2)	Dvali, Georgi	2013‑12‑31	Academic Training Lectures		View details
The Upgrade Programme of the LHC Detectors (2/3)	Riegler, Werner	2013‑12‑31	Academic Training Lectures		View details
Scale-free primordial cosmology		2013‑12‑19	Cosmology and Gravitation	Scientific Series	View details
The Bose-Hubbard model is QMA-complete		2013‑12‑18	Perimeter Institute Quantum Discussions	Scientific Series	View details
(0,4) sigma models and K3		2013‑12‑18	Quantum Fields and Strings	Scientific Series	View details
A lattice non-perturbative definition of chiral fermion/gauge theory from Topological Order		2013‑12‑13	Quantum Matter	Scientific Series	View details
Integrability (and Near Integrability) in Matrix-valued Field Theories		2013‑12‑13	Quantum Fields and Strings	Scientific Series	View details
Curvature in terms of entanglement		2013‑12‑12	Quantum Gravity	Scientific Series	View details
holographic path to the turbulent side of gravity		2013‑12‑12	Cosmology and Gravitation	Scientific Series	View details
Partially Massless Gravity		2013‑12‑11	Colloquium	Scientific Series	View details

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Format results

LHC Beam Instrumentation: Beam Loss and Tune Measurements (3/3)

Game Theory (2/2)

Black Holes from Particle Physics Perspective (2/2)

The Upgrade Programme of the LHC Detectors (2/3)

Scale-free primordial cosmology

The Bose-Hubbard model is QMA-complete

(0,4) sigma models and K3

A lattice non-perturbative definition of chiral fermion/gauge theory from Topological Order

Integrability (and Near Integrability) in Matrix-valued Field Theories

Curvature in terms of entanglement

holographic path to the turbulent side of gravity

Partially Massless Gravity

LHC Beam Instrumentation: Beam Loss and Tune Measurements (3/3)

Game Theory (2/2)

Black Holes from Particle Physics Perspective (2/2)

The Upgrade Programme of the LHC Detectors (2/3)

Scale-free primordial cosmology

The Bose-Hubbard model is QMA-complete

(0,4) sigma models and K3

A lattice non-perturbative definition of chiral fermion/gauge theory from Topological Order

Integrability (and Near Integrability) in Matrix-valued Field Theories

Curvature in terms of entanglement

holographic path to the turbulent side of gravity

Partially Massless Gravity