Talks

9517 - 9528 of 16763 Results

Introduction to Effective Field Theories - Lecture 17

Cliff Burgess McMaster University

March 14, 2014

PIRSA:14030075
Introduction to Quantum Field Theory for Cosmology - Lecture 18

Achim Kempf University of Waterloo

March 13, 2014

PIRSA:14030004
Asymptotic Symmetries of Gauge and Gravity Theories in Minkowski Space

Andrew Strominger Harvard University

March 13, 2014

PIRSA:14030087

Strong Gravity
Maximal Privacy Without Coherence

Debbie Leung Institute for Quantum Computing (IQC)

March 12, 2014

PIRSA:14030105

Quantum Information
Black Holes- the Harmonic Oscillators of the 21st Century

Andrew Strominger Harvard University

March 12, 2014

PIRSA:14030104

Quantum Fields and Strings
DMRG Analysis of Mobile Impurities and Orbital-selective Mott Phases

Julian (Jose) Rincon Universidad de los Andes

March 12, 2014

PIRSA:14030117

Condensed Matter
Introduction to Quantum Field Theory for Cosmology - Lecture 17

Achim Kempf University of Waterloo

March 11, 2014

PIRSA:14030000
Exact holographic mapping and emergent space-time geometry

Xiaoliang Qi Stanford University

March 11, 2014

PIRSA:14030107

Condensed Matter
Line Defects and Tropicalization

Clay Cordova University of Chicago

March 11, 2014

PIRSA:14030106

Quantum Fields and Strings
SDSS-III BOSS and Beyond: fundamental physics with galaxy redshift surveys

Beth Reid Lawrence Berkeley National Laboratory

March 11, 2014

PIRSA:14030096

Cosmology
Introduction to Effective Field Theories - Lecture 16

Cliff Burgess McMaster University

March 07, 2014

PIRSA:14020095
13/14 PSI - Quantum Information Review - Lecture 14

Andrew Childs University of Waterloo

March 07, 2014

PIRSA:14030028

Introduction to Effective Field Theories - Lecture 17

Cliff Burgess McMaster University

March 14, 2014

PIRSA:14030075
Introduction to Quantum Field Theory for Cosmology - Lecture 18

Achim Kempf University of Waterloo

March 13, 2014

PIRSA:14030004
Asymptotic Symmetries of Gauge and Gravity Theories in Minkowski Space

Andrew Strominger Harvard University

March 13, 2014

PIRSA:14030087

Strong Gravity

We argue that the infinite-dimensional BMS symmetry discovered by Bondi et. al in the 60s provides an exact symmetry of the quantum gravity S-matrix. The Ward identity of this symmetry is shown to be precisely Weinberg's soft graviton theorem, also discovered in the 60s. A parallel infinite-dimensional symmetry is found to be generated in nonabelian gauge theories by gauge transformations which go to an angle-dependent finite constant at null infinity. The Ward identity of this symmetry is shown to be the soft gluon theorem.
Maximal Privacy Without Coherence

Debbie Leung Institute for Quantum Computing (IQC)

March 12, 2014

PIRSA:14030105

Quantum Information

Privacy and coherence have long been considered closely related properties of a quantum state. Indeed, a coherently transmitted quantum state is inherently private. Surprisingly, coherent quantum communication is not always required for privacy: there are quantum channels that are too noisy to transmit quantum information but it can send private classical information. Here, we ask how different the private classical and the quantum capacities can be. We present a class of channels N_d with input dimension d^2, quantum capacity Q(N_d) <= 1, and private classical capacity P(N_d) = log d. These channels asymptotically saturate an interesting inequality P(N) <= (log d_A + Q(N))/2 for any channel N with input dimension d_A, and capture the essence of privacy stripped of the confounding influence of coherence.
Black Holes- the Harmonic Oscillators of the 21st Century

Andrew Strominger Harvard University

March 12, 2014

PIRSA:14030104

Quantum Fields and Strings

In the twentieth century, many problems across all of physics were solved by perturbative methods which reduced them to harmonic oscillators. Black holes are poised to play a similar role for the problems of twenty-first century physics. They are at once the simplest and most complex objects in the physical universe. They are maximally complex in that the number of possible microstates, or entropy, of a black hole is believed to saturate a universal bound. They are maximally simple in that, according to Einstein's theory, they are featureless holes in space characterized only by their mass, charge and angular momentum. This dual relation between simplicity and complexity, as expressed in black holes, has recently been successfully applied to problems in a disparate variety of physical systems. I will give an introduction to the subject intended for a general audience.
DMRG Analysis of Mobile Impurities and Orbital-selective Mott Phases

Julian (Jose) Rincon Universidad de los Andes

March 12, 2014

PIRSA:14030117

Condensed Matter
Introduction to Quantum Field Theory for Cosmology - Lecture 17

Achim Kempf University of Waterloo

March 11, 2014

PIRSA:14030000
Exact holographic mapping and emergent space-time geometry

Xiaoliang Qi Stanford University

March 11, 2014

PIRSA:14030107

Condensed Matter

Holographic duality is a duality between quantum many-body systems (boundary) and gravity systems with one additional spatial dimension (bulk). In this talk, I will describe a new approach to holographic duality for lattice systems, called the exact holographic mapping. The key idea of this approach can be summarized by two points: 1) The bulk theory is nothing but the boundary theory viewed in a different basis. 2) Space-time geometry is determined by the structure of correlations and quantum entanglement in a quantum state. For free fermion boundary theories, I will show how different bulk geometries including AdS space, black holes and worm-holes emerge. I will also discuss the generalization of this approach in more generic interacting systems.
Line Defects and Tropicalization

Clay Cordova University of Chicago

March 11, 2014

PIRSA:14030106

Quantum Fields and Strings

I will review BPS line defects in 4d N=2 field theories and describe a technique for calculating their spectra using quiver quantum mechanics.
SDSS-III BOSS and Beyond: fundamental physics with galaxy redshift surveys

Beth Reid Lawrence Berkeley National Laboratory

March 11, 2014

PIRSA:14030096

Cosmology

The SDSS-III Baryon Oscillation Spectroscopic Survey, now nearly complete, is measuring the three-dimensional cosmic structure with 1.35 million new redshifts. Galaxy clustering measurements provide constraints on the cosmic expansion history through the baryon acoustic oscillation feature and the Alcock-Paczynski effect. In addition, the imprint of galaxy peculiar velocities on the observed galaxy clustering, "redshift-space distortions", provides a measurement of the growth rate of matter perturbations. Taken together, these measurements provide excellent constraints on dark energy and test the relation between expansion history and growth of perturbations expected in General Relativity. I will summarize results from BOSS's recent DR11 results and highlight what we may learn about fundamental physics (especially neutrinos) from the upcoming Dark Energy Spectroscopic Instrument (DESI).
Introduction to Effective Field Theories - Lecture 16

Cliff Burgess McMaster University

March 07, 2014

PIRSA:14020095
13/14 PSI - Quantum Information Review - Lecture 14

Andrew Childs University of Waterloo

March 07, 2014

PIRSA:14030028

Title	Date	Collection	Type	Info
Introduction to Effective Field Theories - Lecture 17	2014‑03‑14	Introduction to Effective Field Theories	Course	View details
Introduction to Quantum Field Theory for Cosmology - Lecture 18	2014‑03‑13	Quantum Field Theory for Cosmology - 2014	Course	View details
Asymptotic Symmetries of Gauge and Gravity Theories in Minkowski Space	2014‑03‑13	Strong Gravity	Scientific Series	View details
Maximal Privacy Without Coherence	2014‑03‑12	Perimeter Institute Quantum Discussions	Scientific Series	View details
Black Holes- the Harmonic Oscillators of the 21st Century	2014‑03‑12	Colloquium	Scientific Series	View details
DMRG Analysis of Mobile Impurities and Orbital-selective Mott Phases	2014‑03‑12	Quantum Matter	Scientific Series	View details
Introduction to Quantum Field Theory for Cosmology - Lecture 17	2014‑03‑11	Quantum Field Theory for Cosmology - 2014	Course	View details
Exact holographic mapping and emergent space-time geometry	2014‑03‑11	Quantum Matter	Scientific Series	View details
Line Defects and Tropicalization	2014‑03‑11	Quantum Fields and Strings	Scientific Series	View details
SDSS-III BOSS and Beyond: fundamental physics with galaxy redshift surveys	2014‑03‑11	Cosmology and Gravitation	Scientific Series	View details
Introduction to Effective Field Theories - Lecture 16	2014‑03‑07	Introduction to Effective Field Theories	Course	View details
13/14 PSI - Quantum Information Review - Lecture 14	2014‑03‑07	13/14 PSI - Quantum Information Review	Course	View details

Format results