Talks

10345 - 10356 of 16451 Results

Worldsheet form factors in AdS/CFT

Tristan McLoughlin
Trinity College Dublin

January 08, 2013

PIRSA:13010022

Quantum Fields and Strings
12/13 PSI - Found Quantum Mechanics Lecture 2

Robert Spekkens
Perimeter Institute for Theoretical Physics

January 08, 2013

PIRSA:13010067

Quantum Fields and Strings
Fifth forces and new particles from dark energy

Amol Upadhye
University of Wisconsin–Madison

January 08, 2013

PIRSA:13010023

Cosmology
12/13 PSI - String Theory Review Lecture 2

Barton Zwiebach
Massachusetts Institute of Technology (MIT) - Department of Physics

January 08, 2013

PIRSA:13010044

Quantum Fields and Strings
12/13 PSI - Standard Model Review Lecture 2

Mark Wise
California Institute of Technology (Caltech)

January 08, 2013

PIRSA:13010025

Particle Physics
12/13 PSI - Found Quantum Mechanics Lecture 1

Robert Spekkens
Perimeter Institute for Theoretical Physics

January 07, 2013

PIRSA:13010066

Quantum Fields and Strings
12/13 PSI - String Theory Review Lecture 1

Barton Zwiebach
Massachusetts Institute of Technology (MIT) - Department of Physics

January 07, 2013

PIRSA:13010043
12/13 PSI - Standard Model Review Lecture 1

Mark Wise
California Institute of Technology (Caltech)

January 07, 2013

PIRSA:13010024

Particle Physics
All one-loop amplitudes in N=6 Chern-Simons matter theories

Congkao Wen
Queen Mary University of London

December 18, 2012

PIRSA:12120005

Quantum Fields and Strings
Inference of effective quantum models in the asymptotic regime

December 17, 2012

PIRSA:12120042

Quantum Information
Fermionic toric code model and a new class of topological phases in interacting fermion system

Zheng-Cheng Gu
Chinese University of Hong Kong

December 14, 2012

PIRSA:12120037

Condensed Matter
Accidental Supersymmetry and the Renormalization of Co-dimension 2 Branes

Matthew Williams
PROTO Manufacturing (Canada)

December 14, 2012

PIRSA:12120039

Particle Physics

Worldsheet form factors in AdS/CFT

Tristan McLoughlin
Trinity College Dublin

January 08, 2013

PIRSA:13010022

Quantum Fields and Strings

The study of the worldsheet S-matrix for AdS_5×S^5 strings was a key step in the complete determination of the non-pertubrative planar spectrum of anomalous dimensions for N=4 super-Yang-Mills. To go beyond the spectral problem it is important to consider higher-point worldsheet correlation functions and, as is standard in many integrable models, one approach is the study of form factors. We will discuss a set of consistency conditions appropriate to form factors in the light-cone gauge fixed AdS_5×S^5 string theory. We further discuss the form factors in the weakly coupled dual description, verifying that the relevant conditions naturally hold for the one-loop Heisenberg spin-chain.
12/13 PSI - Found Quantum Mechanics Lecture 2

Robert Spekkens
Perimeter Institute for Theoretical Physics

January 08, 2013

PIRSA:13010067

Quantum Fields and Strings
Fifth forces and new particles from dark energy

Amol Upadhye
University of Wisconsin–Madison

January 08, 2013

PIRSA:13010023

Cosmology

Dark energy coupled to Standard Model fermions and gauge bosons gives rise to fifth forces and new particles, which are readily accessible to experiments from laboratory to cosmological scales. I will discuss chameleon and symmetron models, whose fifth forces are screened locally through large effective masses and symmetry-restoring phase transitions, respectively. Fifth force experiments such as the Eot-Wash torsion balance will test chameleons with small quantum corrections and gravitation-strength fifth forces, as well as symmetrons with coupling energies just beyond the Standard Model scale. A dark energy coupling to electromagnetism would imply that photons passing through a magnetic field will oscillate into particles of dark energy, a phenomenon studied by afterglow experiments such as CHASE. After constraining dark energy using laboratory experiments, I proceed to astrophysical probes. Particles of a photon-coupled dark energy could be produced in the Sun and detected in magnetic helioscopes such as CAST, while fifth forces may alter the dynamics of variable stars and the growth of large-scale structure.
12/13 PSI - String Theory Review Lecture 2

Barton Zwiebach
Massachusetts Institute of Technology (MIT) - Department of Physics

January 08, 2013

PIRSA:13010044

Quantum Fields and Strings
12/13 PSI - Standard Model Review Lecture 2

Mark Wise
California Institute of Technology (Caltech)

January 08, 2013

PIRSA:13010025

Particle Physics
12/13 PSI - Found Quantum Mechanics Lecture 1

Robert Spekkens
Perimeter Institute for Theoretical Physics

January 07, 2013

PIRSA:13010066

Quantum Fields and Strings
12/13 PSI - String Theory Review Lecture 1

Barton Zwiebach
Massachusetts Institute of Technology (MIT) - Department of Physics

January 07, 2013

PIRSA:13010043
12/13 PSI - Standard Model Review Lecture 1

Mark Wise
California Institute of Technology (Caltech)

January 07, 2013

PIRSA:13010024

Particle Physics
All one-loop amplitudes in N=6 Chern-Simons matter theories

Congkao Wen
Queen Mary University of London

December 18, 2012

PIRSA:12120005

Quantum Fields and Strings

In this talk we will present results on all one-loop scattering amplitudes in N=6 Chern-Simons matter theories. Especially we will discuss connection between certain triple-cut diagrams and tree-level recursive diagrams, and a general formula capturing the multi-particle factorization of arbitrary one-loop amplitudes in the theories is obtained from this connection. Furthermore a recursion relation for the supercoefficients of one-loop amplitudes will be derived, which leads the solution for all one-loop amplitudes.
Inference of effective quantum models in the asymptotic regime

December 17, 2012

PIRSA:12120042

Quantum Information

In this talk I will sketch a project which aims at the design of systematic and efficient procedures to infer quantum models from measured data. Progress in experimental control have enabled an increasingly fine tuned probing of the quantum nature of matter, e.g., in superconducting qubits. Such experiments have shown that we not always have a good understanding of how to model the experimentally performed measurements via POVMs. It turns out that the ad hoc postulation of POVMs can lead to inconsistencies. For example, when doing asymptotic state tomography via linear inversion, one sometimes recovers density operators which are significantly not positive semidefinite. Assuming the asymptotic regime, we suggest an alternative procedure where we do not make a priori assumptions on the quantum model, i.e., on the Hilbert space dimension, the prepared states or the measured POVMs. In other words, we simultaneously estimate the dimension of the underlying Hilbert space, the quantum states and the POVMs. We are guided by Occam's razor, i.e., we search for the minimal quantum model consistent with the data.
Fermionic toric code model and a new class of topological phases in interacting fermion system

Zheng-Cheng Gu
Chinese University of Hong Kong

December 14, 2012

PIRSA:12120037

Condensed Matter
Accidental Supersymmetry and the Renormalization of Co-dimension 2 Branes

Matthew Williams
PROTO Manufacturing (Canada)

December 14, 2012

PIRSA:12120039

Particle Physics

In this talk, I'll give a brief summary of how one-loop bulk eﬀects renormalize both bulk and brane eﬀective interactions for geometries sourced by codimension-two branes. I'll then discuss what these results imply for a six-dimensional supergravity model which aims to capture the features that make extra-dimensional physics attractive for understanding naturalness issues in particle physics. I'll also emphasize the role that brane back-reaction plays in yielding unexpected results, and present a one-loop contribution to the 4D vacuum energy whose size is set by the KK scale.

Title	Date	Collection	Type	Info
Worldsheet form factors in AdS/CFT	2013‑01‑08	Quantum Fields and Strings	Scientific Series	View details
12/13 PSI - Found Quantum Mechanics Lecture 2	2013‑01‑08	12/13 PSI - Found Quantum Mechanics	Course	View details
Fifth forces and new particles from dark energy	2013‑01‑08	Cosmology and Gravitation	Scientific Series	View details
12/13 PSI - String Theory Review Lecture 2	2013‑01‑08	12/13 PSI - String Theory Review	Course	View details
12/13 PSI - Standard Model Review Lecture 2	2013‑01‑08	12/13 PSI - Standard Model Review	Course	View details
12/13 PSI - Found Quantum Mechanics Lecture 1	2013‑01‑07	12/13 PSI - Found Quantum Mechanics	Course	View details
12/13 PSI - String Theory Review Lecture 1	2013‑01‑07	12/13 PSI - String Theory Review	Course	View details
12/13 PSI - Standard Model Review Lecture 1	2013‑01‑07	12/13 PSI - Standard Model Review	Course	View details
All one-loop amplitudes in N=6 Chern-Simons matter theories	2012‑12‑18	Quantum Fields and Strings	Scientific Series	View details
Inference of effective quantum models in the asymptotic regime	2012‑12‑17	Quantum Information	Scientific Series	View details
Fermionic toric code model and a new class of topological phases in interacting fermion system	2012‑12‑14	Quantum Matter	Scientific Series	View details
Accidental Supersymmetry and the Renormalization of Co-dimension 2 Branes	2012‑12‑14	Particle Physics	Scientific Series	View details

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