Talks

13225 - 13236 of 20131 Results

Supermassive black holes in non-spherical galactic nuclei and enhanced rates of star capture events

Eugene Vasiliev Rochester Institute of Technology

September 25, 2012

PIRSA:12090064

Astrophysics
Relativity - Lecture 12

Michael Duff Imperial College London

September 25, 2012

PIRSA:12090034
Quantum Theory - Lecture 12

Joseph Emerson Institute for Quantum Computing (IQC)

September 25, 2012

PIRSA:12090015
Probability and Statistics with Prof David Spiegelhalter - Lecture 7

September 25, 2012

PIRSA:12090080
A generalization of Kochen-Specker sets

Laura Mancinska Institute for Quantum Computing (IQC)

September 24, 2012

PIRSA:12090073
Relativity - Lecture 11

Michael Duff Imperial College London

September 24, 2012

PIRSA:12090033
Probability and Statistics with Prof David Spiegelhalter - Lecture 6

September 24, 2012

PIRSA:12090079
Quantum Theory - Lecture 11

Joseph Emerson Institute for Quantum Computing (IQC)

September 24, 2012

PIRSA:12090014
Effect of thermal fluctuations in topological p-wave superconductors

Bela Bauer Microsoft Corporation

September 21, 2012

PIRSA:12090039

Condensed Matter
Relativity - Lecture 10

Michael Duff Imperial College London

September 21, 2012

PIRSA:12090030
Probability and Statistics with Prof David Spiegelhalter - Lecture 5

September 21, 2012

PIRSA:12090078
Relativity - Lecture 9

Michael Duff Imperial College London

September 20, 2012

PIRSA:12090029

Supermassive black holes in non-spherical galactic nuclei and enhanced rates of star capture events

Eugene Vasiliev Rochester Institute of Technology

September 25, 2012

PIRSA:12090064

Astrophysics

We consider the stellar-dynamical processes which lead to the capture or tidal disruption of stars by a supermassive black hole, review the standard theory of two-body relaxation and loss-cone repopulation in spherical galactic nuclei, and extend it to the axisymmetric and triaxial nuclear star clusters. In the absense of symmetry which conserves angular momentum, the orbits of stars experience regular or chaotic changes of angular momentum even in the smooth potential of star cluster, which creates a substantial population of "centrophilic" orbits. We discuss the loss cone draining rates, i.e. rates of capture of stars from these orbits. Next we consider the relaxation phenomena in non-spherical nuclei, focusing on the differences between spherical, axisymmetric and triaxial cases. It turns out that the rates of repopulation of the loss cone are moderately higher in non-spherical systems, but in the triaxial case an additional, often substantial, increase of capture rates comes from draining of the centrophilic orbit population.
Relativity - Lecture 12

Michael Duff Imperial College London

September 25, 2012

PIRSA:12090034
Quantum Theory - Lecture 12

Joseph Emerson Institute for Quantum Computing (IQC)

September 25, 2012

PIRSA:12090015
Probability and Statistics with Prof David Spiegelhalter - Lecture 7

September 25, 2012

PIRSA:12090080

We shall follow the growth of probability theory and applications from the 1650s onwards, in parallel with the development of statistical inference. Bayesian, Neyman-Pearson hypothesis testing and Fisherian likelihood methods will all be covered, with an emphasis on relating theory to a wide range of applications. Practical sessions will use SciPy and feature closed-form solutions, iterative and Monte Carlo simulation methods.
A generalization of Kochen-Specker sets

Laura Mancinska Institute for Quantum Computing (IQC)

September 24, 2012

PIRSA:12090073

I will discuss two generalizations of Kochen-Specker (KS) sets: projective KS sets and generalized KS sets. We will see that projective KS sets can be used to characterize all graphs for which the chromatic number is strictly larger than the quantum chromatic number. Here, the quantum chromatic number is defined via a nonlocal game based on graph coloring. We will further show that from any graph with separation between these two quantities, one can construct a classical channel for which entanglement assistance increases the one-shot zero-error capacity. As an example, we will consider a new family of classical channels with an exponential increase.
Relativity - Lecture 11

Michael Duff Imperial College London

September 24, 2012

PIRSA:12090033
Probability and Statistics with Prof David Spiegelhalter - Lecture 6

September 24, 2012

PIRSA:12090079

We shall follow the growth of probability theory and applications from the 1650s onwards, in parallel with the development of statistical inference. Bayesian, Neyman-Pearson hypothesis testing and Fisherian likelihood methods will all be covered, with an emphasis on relating theory to a wide range of applications. Practical sessions will use SciPy and feature closed-form solutions, iterative and Monte Carlo simulation methods.
Quantum Theory - Lecture 11

Joseph Emerson Institute for Quantum Computing (IQC)

September 24, 2012

PIRSA:12090014
Effect of thermal fluctuations in topological p-wave superconductors

Bela Bauer Microsoft Corporation

September 21, 2012

PIRSA:12090039

Condensed Matter

In this talk, I will present our recent work on the effect of thermal fluctuations on the topological stability of chiral p-wave superconductors. We consider two models of superconductors: spinless and spinful with a focus on topological properties and Majorana zero-energy modes. We show that proliferation of vortex-antivortex pairs above the Kosterlitz-Thouless temperature T_KT drives the transition from a thermal Quantum Hall insulator to a thermal metal/insulator, and dramatically modifies the ground-state degeneracy splitting. This shows that in order to utilize 2D chiral p-wave superconductors for topological quantum computing, the temperature should be much smaller than T_KT. Within the spinful chiral p-wave model, we also investigate the interplay between half-quantum vortices carrying Majorana zero-energy modes and full-quantum vortices having trivial topological charge, and discuss topological properties of half-quantum vortices in the background of proliferating full-quantum vortices.
Relativity - Lecture 10

Michael Duff Imperial College London

September 21, 2012

PIRSA:12090030
Probability and Statistics with Prof David Spiegelhalter - Lecture 5

September 21, 2012

PIRSA:12090078

We shall follow the growth of probability theory and applications from the 1650s onwards, in parallel with the development of statistical inference. Bayesian, Neyman-Pearson hypothesis testing and Fisherian likelihood methods will all be covered, with an emphasis on relating theory to a wide range of applications. Practical sessions will use SciPy and feature closed-form solutions, iterative and Monte Carlo simulation methods.
Relativity - Lecture 9

Michael Duff Imperial College London

September 20, 2012

PIRSA:12090029

Title	Date	Collection	Type	Info
Supermassive black holes in non-spherical galactic nuclei and enhanced rates of star capture events	2012‑09‑25	Cosmology and Gravitation	Scientific Series	View details
Relativity - Lecture 12	2012‑09‑25	12/13 PSI - Relativity	Course	View details
Quantum Theory - Lecture 12	2012‑09‑25	12/13 PSI - Quantum Theory	Course	View details
Probability and Statistics with Prof David Spiegelhalter - Lecture 7	2012‑09‑25	Probability and Statistics	Course	View details
A generalization of Kochen-Specker sets	2012‑09‑24	Perimeter Institute Quantum Discussions	Scientific Series	View details
Relativity - Lecture 11	2012‑09‑24	12/13 PSI - Relativity	Course	View details
Probability and Statistics with Prof David Spiegelhalter - Lecture 6	2012‑09‑24	Probability and Statistics	Course	View details
Quantum Theory - Lecture 11	2012‑09‑24	12/13 PSI - Quantum Theory	Course	View details
Effect of thermal fluctuations in topological p-wave superconductors	2012‑09‑21	Quantum Matter	Scientific Series	View details
Relativity - Lecture 10	2012‑09‑21	12/13 PSI - Relativity	Course	View details
Probability and Statistics with Prof David Spiegelhalter - Lecture 5	2012‑09‑21	Probability and Statistics	Course	View details
Relativity - Lecture 9	2012‑09‑20	12/13 PSI - Relativity	Course	View details

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Format results

Supermassive black holes in non-spherical galactic nuclei and enhanced rates of star capture events

Relativity - Lecture 12

Quantum Theory - Lecture 12

Probability and Statistics with Prof David Spiegelhalter - Lecture 7

A generalization of Kochen-Specker sets

Relativity - Lecture 11

Probability and Statistics with Prof David Spiegelhalter - Lecture 6

Quantum Theory - Lecture 11

Effect of thermal fluctuations in topological p-wave superconductors

Relativity - Lecture 10

Probability and Statistics with Prof David Spiegelhalter - Lecture 5

Relativity - Lecture 9

Supermassive black holes in non-spherical galactic nuclei and enhanced rates of star capture events

Relativity - Lecture 12

Quantum Theory - Lecture 12

Probability and Statistics with Prof David Spiegelhalter - Lecture 7

A generalization of Kochen-Specker sets

Relativity - Lecture 11

Probability and Statistics with Prof David Spiegelhalter - Lecture 6

Quantum Theory - Lecture 11

Effect of thermal fluctuations in topological p-wave superconductors

Relativity - Lecture 10

Probability and Statistics with Prof David Spiegelhalter - Lecture 5

Relativity - Lecture 9