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9649 - 9660 of 16958 Results

Categories of Convex Sets and C*-Algebras

Robert Furber Radboud Universiteit Nijmegen
April 15, 2014

PIRSA:14040140
Quantum Physics
Boson Tagging with Wavelets

William Shepherd University of California, Santa Cruz
April 15, 2014

PIRSA:14040063
High Energy Physics
Groups and Clusters of Galaxies: Where Cosmology and Astrophysics Collide

Arif Babul University of Victoria
April 15, 2014

PIRSA:14040133
Astrophysics
13/14 PSI - Explorations in Cosmology - Lecture 7

Matthew Johnson York University

April 15, 2014

PIRSA:14040049
New Exact Results in Calabi-Yau, D-branes, and Orientifolds

Sungjay Lee University of Cambridge
April 15, 2014

PIRSA:14040081
High Energy Physics
13/14 PSI - Explorations in Particle Theory - Lecture 7

Brian Shuve Harvey Mudd College

April 15, 2014

PIRSA:14030054
13/14 PSI - Explorations in Cosmology - Lecture 6

Matthew Johnson York University

April 14, 2014

PIRSA:14040048
13/14 PSI - Explorations in Particle Theory - Lecture 6

Brian Shuve Harvey Mudd College

April 14, 2014

PIRSA:14030053
The computational power of quantum walk

Andrew Childs University of Waterloo

April 11, 2014

PIRSA:14040135
13/14 PSI - Explorations in Cosmology - Lecture 5

Matthew Johnson York University

April 11, 2014

PIRSA:14040045
13/14 PSI - Explorations in Particle Theory - Lecture 5

Brian Shuve Harvey Mudd College

April 11, 2014

PIRSA:14030048
Quantum cosmology in Lorentz-violating gravity
April 10, 2014

PIRSA:14040079
General Relativity & Quantum Cosmology

Categories of Convex Sets and C*-Algebras

Robert Furber Radboud Universiteit Nijmegen
April 15, 2014

PIRSA:14040140
Quantum Physics
The start of the talk will be an outline how the ordinary notions of quantum theory translate into the category of C*-algebras, where there are several possible choices of morphisms. The second half will relate this to a category of convex sets used as state spaces. Alfsen and Shultz have characterized the convex sets arising from state spaces C*-algebras and this result can be applied to get a categorical equivalence between C*-algebras and state spaces of C*-algebras which is a generalization of the equivalence between the Schroedinger and Heisenberg pictures.
Boson Tagging with Wavelets

William Shepherd University of California, Santa Cruz
April 15, 2014

PIRSA:14040063
High Energy Physics
I'll present a proof-of-concept new technique for tagging boosted objects which decay into two colored particles based on the wavelet transform. It is able to moderately improve the sensitivity of searches for such particles by 6-7%. I will also discuss future directions of applicability.
Groups and Clusters of Galaxies: Where Cosmology and Astrophysics Collide

Arif Babul University of Victoria
April 15, 2014

PIRSA:14040133
Astrophysics
Groups and clusters of galaxies are the most massive gravitationally bound objects in the Universe. They are also the most recent cosmic objects to form. In the currently accepted models of cosmic structure formation, the number density distribution of the most massive of these systems, and how this has been changing with time, depend sensitively to the parameters describing the large-scale geometry and the expansion history of the universe. However, to exploit galaxy clusters as cosmological probes, we must be able to relate their observable properties to their total mass. I will discuss our ongoing effort to calibrate the X-ray/SZ observations to the total mass for the 50 clusters comprising the Canadian Cluster Comparison Project (CCCP) sample. Resulting scaling relations, the associated scatter, and even how these change with time, invariably depend on "astrophysics" unfolding in these systems. The precision with which the cosmological parameters can be determined depends critically on how well we understand why groups and clusters manifest the observed properties that they do. This, however, has proven challenging. I will provide an update of the current state of affairs and highlight some of the key gaps in our understanding of the underlying physics.
13/14 PSI - Explorations in Cosmology - Lecture 7

Matthew Johnson York University

April 15, 2014

PIRSA:14040049
New Exact Results in Calabi-Yau, D-branes, and Orientifolds

Sungjay Lee University of Cambridge
April 15, 2014

PIRSA:14040081
High Energy Physics
We compute the exact two-sphere, disk and real projective plane partition functions of two-dimensional supersymmetric theories using the localization technique. From these new results, we will attack old and new important problems in the string theory on Calabi-Yau spaces, and D-branes and Orientifold planes therein.
13/14 PSI - Explorations in Particle Theory - Lecture 7

Brian Shuve Harvey Mudd College

April 15, 2014

PIRSA:14030054
13/14 PSI - Explorations in Cosmology - Lecture 6

Matthew Johnson York University

April 14, 2014

PIRSA:14040048
13/14 PSI - Explorations in Particle Theory - Lecture 6

Brian Shuve Harvey Mudd College

April 14, 2014

PIRSA:14030053
The computational power of quantum walk

Andrew Childs University of Waterloo

April 11, 2014

PIRSA:14040135

Quantum computers have the potential to solve certain problems dramatically faster than classical computers. One of the main quantum algorithmic tools is the notion of quantum walk, a quantum mechanical analog of random walk. I will describe quantum algorithms based on this idea, including an optimal algorithm for evaluating Boolean formulas and one of the best known algorithms for simulating quantum dynamics. I will also show how quantum walk can be viewed as a universal model of quantum computation.
13/14 PSI - Explorations in Cosmology - Lecture 5

Matthew Johnson York University

April 11, 2014

PIRSA:14040045
13/14 PSI - Explorations in Particle Theory - Lecture 5

Brian Shuve Harvey Mudd College

April 11, 2014

PIRSA:14030048
Quantum cosmology in Lorentz-violating gravity
April 10, 2014

PIRSA:14040079
General Relativity & Quantum Cosmology
Lorentz invariance is considered a fundamental symmetry of physical theories. However, while Lorentz violations are strongly constrained in the matter sector, constraints in the gravitational sector are weaker, allowing to contemplate the idea of Lorentz-violating gravity theories. In this talk I will discuss the effects of Lorentz violations in the quantum cosmology scenario by analyzing the properties of a simple anisotropic model in the framework of Horava-Lifshitz gravity and, if time permitting, some partial results on the viability of this class of theories.

Title	Date	Collection	Type	Info
Categories of Convex Sets and C*-Algebras	2014‑04‑15	Quantum Foundations	Scientific Series	View details
Boson Tagging with Wavelets	2014‑04‑15	Particle Physics	Scientific Series	View details
Groups and Clusters of Galaxies: Where Cosmology and Astrophysics Collide	2014‑04‑15	Cosmology and Gravitation	Scientific Series	View details
13/14 PSI - Explorations in Cosmology - Lecture 7	2014‑04‑15	13/14 PSI - Explorations in Cosmology	Course	View details
New Exact Results in Calabi-Yau, D-branes, and Orientifolds	2014‑04‑15	Quantum Fields and Strings	Scientific Series	View details
13/14 PSI - Explorations in Particle Theory - Lecture 7	2014‑04‑15	13/14 PSI - Explorations in Particle Theory	Course	View details
13/14 PSI - Explorations in Cosmology - Lecture 6	2014‑04‑14	13/14 PSI - Explorations in Cosmology	Course	View details
13/14 PSI - Explorations in Particle Theory - Lecture 6	2014‑04‑14	13/14 PSI - Explorations in Particle Theory	Course	View details
The computational power of quantum walk	2014‑04‑11	Colloquium	Scientific Series	View details
13/14 PSI - Explorations in Cosmology - Lecture 5	2014‑04‑11	13/14 PSI - Explorations in Cosmology	Course	View details
13/14 PSI - Explorations in Particle Theory - Lecture 5	2014‑04‑11	13/14 PSI - Explorations in Particle Theory	Course	View details
Quantum cosmology in Lorentz-violating gravity	2014‑04‑10	Quantum Gravity	Scientific Series	View details

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Format results

Categories of Convex Sets and C*-Algebras

Boson Tagging with Wavelets

Groups and Clusters of Galaxies: Where Cosmology and Astrophysics Collide

13/14 PSI - Explorations in Cosmology - Lecture 7

New Exact Results in Calabi-Yau, D-branes, and Orientifolds

13/14 PSI - Explorations in Particle Theory - Lecture 7

13/14 PSI - Explorations in Cosmology - Lecture 6

13/14 PSI - Explorations in Particle Theory - Lecture 6

The computational power of quantum walk

13/14 PSI - Explorations in Cosmology - Lecture 5

13/14 PSI - Explorations in Particle Theory - Lecture 5

Quantum cosmology in Lorentz-violating gravity

Categories of Convex Sets and C*-Algebras

Boson Tagging with Wavelets

Groups and Clusters of Galaxies: Where Cosmology and Astrophysics Collide

13/14 PSI - Explorations in Cosmology - Lecture 7

New Exact Results in Calabi-Yau, D-branes, and Orientifolds

13/14 PSI - Explorations in Particle Theory - Lecture 7

13/14 PSI - Explorations in Cosmology - Lecture 6

13/14 PSI - Explorations in Particle Theory - Lecture 6

The computational power of quantum walk

13/14 PSI - Explorations in Cosmology - Lecture 5

13/14 PSI - Explorations in Particle Theory - Lecture 5

Quantum cosmology in Lorentz-violating gravity