Talks

10501 - 10512 of 16754 Results

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
Bounding the purification rank of mixed states

Gemma De Las Cuevas Universität Innsbruck

February 25, 2013

PIRSA:13020149

Quantum Information
12/13 PSI - Cosmology Review Lecture 5

Latham Boyle University of Edinburgh

February 25, 2013

PIRSA:13020105

Cosmology
Beyond Massive Gravity

Rachel Rosen Carnegie Mellon University

February 25, 2013

PIRSA:13020134

Cosmology
12/13 PSI - Quantum Information Review Lecture 5

Andrew Childs University of Waterloo

February 25, 2013

PIRSA:13020115

Quantum Information
12/13 PSI - Beyond the Standard Model Lecture 5

Itay Yavin McMaster University

Natalia Toro Stanford University

February 25, 2013

PIRSA:13020095

Particle Physics
Closing Summary Talks

Peter Loch University of Arizona

Michael Spannowsky Durham University

Brian Shuve Harvey Mudd College

February 23, 2013

PIRSA:13020145
12/13 PSI - Quantum Information Review Lecture 4

Andrew Childs University of Waterloo

February 22, 2013

PIRSA:13020112

Quantum Information
12/13 PSI - Beyond the Standard Model Lecture 4

Itay Yavin McMaster University

Natalia Toro Stanford University

February 22, 2013

PIRSA:13020092

Particle Physics
Advanced General Relativity - Lecture 10

Rafael Sorkin Perimeter Institute for Theoretical Physics

February 21, 2013

PIRSA:13020021

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
Bounding the purification rank of mixed states

Gemma De Las Cuevas Universität Innsbruck

February 25, 2013

PIRSA:13020149

Quantum Information

A mixed state can be expressed as a sum of D tensor product matrices, where D is its operator Schmidt rank, or as the result of a purification with a purifying state of Schmidt rank D', where D' is its purification rank. The question whether D' can be upper bounded by D is important theoretically (to establish a description of mixed states with tensor networks), as well as numerically (as the first decomposition is more efficient, but the second one guarantees positive-semidefiniteness after truncation). Here we show that no upper bounds of the purification rank that depend only on operator Schmidt rank exist, but provide upper bounds that also depend on the number of eigenvalues. In addition, we formulate the approximation problem as a Semidefinite Program.
Joint work with N. Schuch, D. Perez-Garcia, and J. I. Cirac.
12/13 PSI - Cosmology Review Lecture 5

Latham Boyle University of Edinburgh

February 25, 2013

PIRSA:13020105

Cosmology
Beyond Massive Gravity

Rachel Rosen Carnegie Mellon University

February 25, 2013

PIRSA:13020134

Cosmology

In the last few years there has been a burst of progress in the field of massive gravity. The construction of consistent theories in which the graviton has a small mass has in turn led to the development a new family of compelling, consistent low-energy modifications of General Relativity. These theories improve our understanding of the interplay between gravity and particle physics and provide new approaches to solving the cosmological constant problem. In this talk I will review these recent developments. I will discuss the search among these new theories for a symmetry that has the potential to address the cosmological constant problem.
12/13 PSI - Quantum Information Review Lecture 5

Andrew Childs University of Waterloo

February 25, 2013

PIRSA:13020115

Quantum Information
12/13 PSI - Beyond the Standard Model Lecture 5

Itay Yavin McMaster University

Natalia Toro Stanford University

February 25, 2013

PIRSA:13020095

Particle Physics
Closing Summary Talks

Peter Loch University of Arizona

Michael Spannowsky Durham University

Brian Shuve Harvey Mudd College

February 23, 2013

PIRSA:13020145
12/13 PSI - Quantum Information Review Lecture 4

Andrew Childs University of Waterloo

February 22, 2013

PIRSA:13020112

Quantum Information
12/13 PSI - Beyond the Standard Model Lecture 4

Itay Yavin McMaster University

Natalia Toro Stanford University

February 22, 2013

PIRSA:13020092

Particle Physics
Advanced General Relativity - Lecture 10

Rafael Sorkin Perimeter Institute for Theoretical Physics

February 21, 2013

PIRSA:13020021

Title	Date	Collection	Type	Info
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
Bounding the purification rank of mixed states	2013‑02‑25	Perimeter Institute Quantum Discussions	Scientific Series	View details
12/13 PSI - Cosmology Review Lecture 5	2013‑02‑25	12/13 PSI - Cosmology Review	Course	View details
Beyond Massive Gravity	2013‑02‑25	Colloquium	Scientific Series	View details
12/13 PSI - Quantum Information Review Lecture 5	2013‑02‑25	12/13 PSI - Quantum Information Review	Course	View details
12/13 PSI - Beyond the Standard Model Lecture 5	2013‑02‑25	12/13 PSI - Beyond the Standard Model	Course	View details
Closing Summary Talks	2013‑02‑23	Applications of Jet Substructure 2013	Conference	View details
12/13 PSI - Quantum Information Review Lecture 4	2013‑02‑22	12/13 PSI - Quantum Information Review	Course	View details
12/13 PSI - Beyond the Standard Model Lecture 4	2013‑02‑22	12/13 PSI - Beyond the Standard Model	Course	View details
Advanced General Relativity - Lecture 10	2013‑02‑21	Elements of General Relativity	Course	View details

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