Talks

10189 - 10200 of 16451 Results

12/13 PSI - Cosmology Review Lecture 7

Latham Boyle
University of Edinburgh

February 27, 2013

PIRSA:13020107

Cosmology
12/13 PSI - Quantum Information Review Lecture 7

Andrew Childs
University of Waterloo

February 27, 2013

PIRSA:13020117

Quantum Information
12/13 PSI - Beyond the Standard Model Lecture 7

Itay Yavin
McMaster University

Natalia Toro
Stanford University

February 27, 2013

PIRSA:13020097

Particle Physics
Advanced General Relativity - Lecture 11

Rafael Sorkin
Perimeter Institute for Theoretical Physics

February 26, 2013

PIRSA:13020026
The universe as a process of unique events

Lee Smolin
Perimeter Institute for Theoretical Physics

February 26, 2013

PIRSA:13020146

Quantum Foundations
Quantum Computation vs. Firewalls

Daniel Harlow
Massachusetts Institute of Technology (MIT)

February 26, 2013

PIRSA:13020138

Quantum Information

Quantum Fields and Strings
DMRG Studies on the Spin Liquid Ground State of the Kagome Model

Stefan Depenbrock
Ludwig-Maximilians-Universitiät München (LMU)

February 26, 2013

PIRSA:13020147

Condensed Matter
FERMI 130 GeV Line: Dark Interpretations

Matthew McCullough
Massachusetts Institute of Technology (MIT)

February 26, 2013

PIRSA:13020150

Particle Physics
12/13 PSI - Cosmology Review Lecture 6

Latham Boyle
University of Edinburgh

February 26, 2013

PIRSA:13020106

Cosmology
Newton’s Method in Cosmology Today

Bill Harp
Western University

February 26, 2013

PIRSA:13020151

Cosmology
12/13 PSI - Quantum Information Review Lecture 6

Andrew Childs
University of Waterloo

February 26, 2013

PIRSA:13020116

Quantum Information
12/13 PSI - Beyond the Standard Model Lecture 6

Itay Yavin
McMaster University

Natalia Toro
Stanford University

February 26, 2013

PIRSA:13020096

Particle Physics

12/13 PSI - Cosmology Review Lecture 7

Latham Boyle
University of Edinburgh

February 27, 2013

PIRSA:13020107

Cosmology
12/13 PSI - Quantum Information Review Lecture 7

Andrew Childs
University of Waterloo

February 27, 2013

PIRSA:13020117

Quantum Information
12/13 PSI - Beyond the Standard Model Lecture 7

Itay Yavin
McMaster University

Natalia Toro
Stanford University

February 27, 2013

PIRSA:13020097

Particle Physics
Advanced General Relativity - Lecture 11

Rafael Sorkin
Perimeter Institute for Theoretical Physics

February 26, 2013

PIRSA:13020026
The universe as a process of unique events

Lee Smolin
Perimeter Institute for Theoretical Physics

February 26, 2013

PIRSA:13020146

Quantum Foundations
Quantum Computation vs. Firewalls

Daniel Harlow
Massachusetts Institute of Technology (MIT)

February 26, 2013

PIRSA:13020138

Quantum Information

Quantum Fields and Strings
DMRG Studies on the Spin Liquid Ground State of the Kagome Model

Stefan Depenbrock
Ludwig-Maximilians-Universitiät München (LMU)

February 26, 2013

PIRSA:13020147

Condensed Matter

I will present a density-matrix renormalization group (DMRG) study of the S=1/2 Heisenberg antiferromagnet on the kagome lattice to identify the conjectured spin liquid ground state. Exploiting SU(2) spin symmetry, which allows us to keep up to 16,000 DMRG states, we consider cylinders with circumferences up to 17 lattice spacings and find a spin liquid ground state with an estimated per site energy of -0.4386(5), a spin gap of 0.13(1), very short-range decay in spin, dimer and chiral correlation functions and finite topological entanglement consistent with the logarithm of 2, ruling out gapless, chiral or non-topological spin liquids. All this would provide strong evidence for a gapped topological Z_2 spin liquid.
FERMI 130 GeV Line: Dark Interpretations

Matthew McCullough
Massachusetts Institute of Technology (MIT)

February 26, 2013

PIRSA:13020150

Particle Physics

Last year strong evidence was claimed for a 130 GeV gamma ray line from the galactic center in the FERMI telescope data. In the first half of the talk I will review the status of the evidence, including recent suggestions which call it into question. In the second half of the talk, under the bold assumption that the line is a genuine signature of dark matter, I will review some of the properties required of dark matter to explain the line and the general features of models proposed to explain it. This second half will include material from recent work with Francesco D'Eramo and Jesse Thaler (arxiv:1210.7817), which suggests that the line is readily explained by dark matter "semi-annihilation" rather than the standard annihilation interpretation.
12/13 PSI - Cosmology Review Lecture 6

Latham Boyle
University of Edinburgh

February 26, 2013

PIRSA:13020106

Cosmology
Newton’s Method in Cosmology Today

Bill Harp
Western University

February 26, 2013

PIRSA:13020151

Cosmology

Newton’s inferences from phenomena realize an ideal of empirical success that’s richer than prediction. To realize Newton’s richer conception of empirical success a theory needs to do more than to accurately predict the phenomena it purports to explain: in addition it needs to have the phenomena accurately measure parameters of the theory. Newton’s method aims to turn theoretical questions into ones which can be empirically answered by measurements from phenomena. Propositions inferred from phenomena are provisionally accepted as guides to further research. Newton’s ideal of empirical success as agreeing measurements from diverse phenomena is appealed to in support of the radical inference to dark energy in cosmology today. Robert Kirshner (two of his PhDs share one half of 2011’s Nobel Prize in physics) gave an account of the role of cosmic microwave background measurements, to back up the supernova measurements and measurements from galaxy clustering in supporting the transition of dark energy from a wild hypothesis into an accepted background assumption that guides further research in cosmology today. This illustrates a feature of agreeing measurements from diverse phenomena that is especially important for turning data into evidence. To the extent that the sources of systematic error of the different measurements can be regarded as independent, their agreement contributes additional support for counting them as accurate rather than as mere artifacts of systematic error.
12/13 PSI - Quantum Information Review Lecture 6

Andrew Childs
University of Waterloo

February 26, 2013

PIRSA:13020116

Quantum Information
12/13 PSI - Beyond the Standard Model Lecture 6

Itay Yavin
McMaster University

Natalia Toro
Stanford University

February 26, 2013

PIRSA:13020096

Particle Physics

Title	Date	Collection	Type	Info
12/13 PSI - Cosmology Review Lecture 7	2013‑02‑27	12/13 PSI - Cosmology Review	Course	View details
12/13 PSI - Quantum Information Review Lecture 7	2013‑02‑27	12/13 PSI - Quantum Information Review	Course	View details
12/13 PSI - Beyond the Standard Model Lecture 7	2013‑02‑27	12/13 PSI - Beyond the Standard Model	Course	View details
Advanced General Relativity - Lecture 11	2013‑02‑26	Elements of General Relativity	Course	View details
The universe as a process of unique events	2013‑02‑26	Quantum Foundations	Scientific Series	View details
Quantum Computation vs. Firewalls	2013‑02‑26	Quantum Fields and Strings	Scientific Series	View details
DMRG Studies on the Spin Liquid Ground State of the Kagome Model	2013‑02‑26	Quantum Matter	Scientific Series	View details
FERMI 130 GeV Line: Dark Interpretations	2013‑02‑26	Particle Physics	Scientific Series	View details
12/13 PSI - Cosmology Review Lecture 6	2013‑02‑26	12/13 PSI - Cosmology Review	Course	View details
Newton’s Method in Cosmology Today	2013‑02‑26	Cosmology and Gravitation	Scientific Series	View details
12/13 PSI - Quantum Information Review Lecture 6	2013‑02‑26	12/13 PSI - Quantum Information Review	Course	View details
12/13 PSI - Beyond the Standard Model Lecture 6	2013‑02‑26	12/13 PSI - Beyond the Standard Model	Course	View details

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