Talks

10417 - 10428 of 16652 Results

The Evolution of Quasars with Cosmic Time

Michael Strauss Princeton University

February 20, 2013

PIRSA:13020120
12/13 PSI - Cosmology Review Lecture 2

Latham Boyle University of Edinburgh

February 20, 2013

PIRSA:13020100

Cosmology
A K matrix construction of symmetry enriched phases

February 20, 2013

PIRSA:13020140

Condensed Matter
12/13 PSI - Quantum Information Review Lecture 2

Andrew Childs University of Waterloo

February 20, 2013

PIRSA:13020110

Quantum Information
12/13 PSI - Beyond the Standard Model Lecture 2

Itay Yavin McMaster University

Natalia Toro Stanford University

February 20, 2013

PIRSA:13020090

Particle Physics
Advanced General Relativity - Lecture 9

Rafael Sorkin Perimeter Institute for Theoretical Physics

February 19, 2013

PIRSA:13020019
Wall-Crossing and Quiver Invariants

Piljin Yi Korea Institute for Advanced Study

February 19, 2013

PIRSA:13020137

Quantum Fields and Strings
Qanti-kt: Nondeterministic jet clustering

David Krohn Harvard University

February 19, 2013

PIRSA:13020135

Particle Physics
12/13 PSI - Cosmology Review Lecture 1

Latham Boyle University of Edinburgh

February 19, 2013

PIRSA:13020099

Cosmology
12/13 PSI - Quantum Information Review Lecture 1

Andrew Childs University of Waterloo

February 19, 2013

PIRSA:13020109

Quantum Information
12/13 PSI - Beyond the Standard Model Lecture 1

Itay Yavin McMaster University

Natalia Toro Stanford University

February 19, 2013

PIRSA:13020089

Particle Physics
12/13 PSI - Condensed Matter Review Lecture 14

Dmitry Abanin

February 15, 2013

PIRSA:13020088

Condensed Matter

The Evolution of Quasars with Cosmic Time

Michael Strauss Princeton University

February 20, 2013

PIRSA:13020120

While the luminosity and mass distributions of quasars has evolved dramatically with cosmic time, the physical properties of quasars of a given luminosity are remarkably independent of redshift. I will describe recent results on the spectra of luminous quasars, the dark matter halos in which they sit, and the intergalactic medium of their host galaxies, that are essentially indistinguishable from moderate redshifts to z>6. The one property apparently unique to the highest-redshift quasars is that some small fraction show evidence for having very little infrared excess from hot dust. Dust obscuration is another theme in quasar studies; an appreciable fraction of the growth of black holes may be hidden at optical wavelengths by dust. I will describe searches for obscured quasars at high redshift and low, and studies of their demographics and physical properties.
12/13 PSI - Cosmology Review Lecture 2

Latham Boyle University of Edinburgh

February 20, 2013

PIRSA:13020100

Cosmology
A K matrix construction of symmetry enriched phases

February 20, 2013

PIRSA:13020140

Condensed Matter

We construct in the K matrix formalism concrete examples of symmetry enriched topological phases, namely intrinsically topological phases with global symmetries. We focus on the Abelian and non-chiral topological phases and demonstrate by our examples how the interplay between the global symmetry and the fusion algebra of the anyons of a topologically ordered system determines the existence of gapless edge modes protected by the symmetry and that a (quasi)-group structure can be defined among these phases. Our examples include phases that display charge fractionalization and more exotic non-local anyon exchange under global symmetry that correspond to general group extensions of the global symmetry group.
12/13 PSI - Quantum Information Review Lecture 2

Andrew Childs University of Waterloo

February 20, 2013

PIRSA:13020110

Quantum Information
12/13 PSI - Beyond the Standard Model Lecture 2

Itay Yavin McMaster University

Natalia Toro Stanford University

February 20, 2013

PIRSA:13020090

Particle Physics
Advanced General Relativity - Lecture 9

Rafael Sorkin Perimeter Institute for Theoretical Physics

February 19, 2013

PIRSA:13020019
Wall-Crossing and Quiver Invariants

Piljin Yi Korea Institute for Advanced Study

February 19, 2013

PIRSA:13020137

Quantum Fields and Strings

We start with a one-slide review of the Kontsevich-Soibelman (KS) solution to the wall-crossing problem and then proceed to direct and comprehensive physics counting of BPS states that eventually connects to KS. We also asks what input data is needed for either approaches to produce complete BPS spectra, and this naturally leads to the BPS quiver representation of BPS states and the new notion of quiver invariants.
We propose a simple geometrical conjecture that can segregate BPS states in Higgs phases of the BPS quiver dynamics to those that experience wall-crossing and those that do not, and give
proofs for all cyclice Abelian quivers. We close with explanation of how physics distinguishes two such classes of BPS states.
Qanti-kt: Nondeterministic jet clustering

David Krohn Harvard University

February 19, 2013

PIRSA:13020135

Particle Physics

The interpretation of events with jets is often ambiguous, especially for the sort of highly complex events one encounters at the LHC. One often finds that an event interpreted as signal-like using one choice of jet algorithm and radius parameter is no longer signal-like with another, even if the two are very similar. Here we present an extension of the Qjets procedure designed to account for this ambiguity and assign each plausible interpretation of an event a weight, so that events which are unambiguously signal-like carry more influence on one's results than events which are only marginally so. This procedure can be used with any existing analysis employing a sequential recombination algorithm like anti-kT and we will show that through its use the statistical power of an analysis often increases. In particular, we will see that a up to a 20\% improvement in statistical significance can be realized for a Higgs-like analysis searching for a resonance recoiling against an associated vector boson.
12/13 PSI - Cosmology Review Lecture 1

Latham Boyle University of Edinburgh

February 19, 2013

PIRSA:13020099

Cosmology
12/13 PSI - Quantum Information Review Lecture 1

Andrew Childs University of Waterloo

February 19, 2013

PIRSA:13020109

Quantum Information
12/13 PSI - Beyond the Standard Model Lecture 1

Itay Yavin McMaster University

Natalia Toro Stanford University

February 19, 2013

PIRSA:13020089

Particle Physics
12/13 PSI - Condensed Matter Review Lecture 14

Dmitry Abanin

February 15, 2013

PIRSA:13020088

Condensed Matter

Title	Date	Collection	Type	Info
The Evolution of Quasars with Cosmic Time	2013‑02‑20	Colloquium	Scientific Series	View details
12/13 PSI - Cosmology Review Lecture 2	2013‑02‑20	12/13 PSI - Cosmology Review	Course	View details
A K matrix construction of symmetry enriched phases	2013‑02‑20	Quantum Matter	Scientific Series	View details
12/13 PSI - Quantum Information Review Lecture 2	2013‑02‑20	12/13 PSI - Quantum Information Review	Course	View details
12/13 PSI - Beyond the Standard Model Lecture 2	2013‑02‑20	12/13 PSI - Beyond the Standard Model	Course	View details
Advanced General Relativity - Lecture 9	2013‑02‑19	Elements of General Relativity	Course	View details
Wall-Crossing and Quiver Invariants	2013‑02‑19	Quantum Fields and Strings	Scientific Series	View details
Qanti-kt: Nondeterministic jet clustering	2013‑02‑19	Particle Physics	Scientific Series	View details
12/13 PSI - Cosmology Review Lecture 1	2013‑02‑19	12/13 PSI - Cosmology Review	Course	View details
12/13 PSI - Quantum Information Review Lecture 1	2013‑02‑19	12/13 PSI - Quantum Information Review	Course	View details
12/13 PSI - Beyond the Standard Model Lecture 1	2013‑02‑19	12/13 PSI - Beyond the Standard Model	Course	View details
12/13 PSI - Condensed Matter Review Lecture 14	2013‑02‑15	12/13 PSI - Condensed Matter Review	Course	View details

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