Triangle Seminars
Monday, 26 Feb 2007
Sigma model RG flow and Perelman's entropy
Arkady Tseytlin
(Imperial College)
Tuesday, 27 Feb 2007
Statistics of electric current through chaotic systems: random matrix theory and semiclassics
Marcel Novaes
(Bristol)
Abstract:
The electric current that flows through a chaotic system like a quantum dot may, as a function of time, be characterized by its moments. The first and second moments are called the conductance and the shot noise. We consider the problem of calculating all higher moments, both within a random matrix theory formulation and by resorting to classical action correlations.
The electric current that flows through a chaotic system like a quantum dot may, as a function of time, be characterized by its moments. The first and second moments are called the conductance and the shot noise. We consider the problem of calculating all higher moments, both within a random matrix theory formulation and by resorting to classical action correlations.
Posted by: brunel
Wednesday, 28 Feb 2007
Type II actions from 11D Chern-Simons theories
📍 London
Dmitriy Belov
(Imperial)
Abstract:
This talk continues the discussion of hep-th/0605038, applying the holographic formulation of self-dual theory to the Ramond-Ramond fields of type II supergravity. We formulate the RR partition function, in the presence of nontrivial H-fields, in terms of the wavefunction of an 11-dimensional Chern-Simons theory. Using the methods of hep-th/0605038 we show how to formulate an action principle for the RR fields of both type IIA and type IIB supergravity, in the presence of RR current. We find a new
topological restriction on consistent backgrounds of type IIA supergravity, namely the fourth Wu class must have a lift to the H-twisted cohomology.
This talk continues the discussion of hep-th/0605038, applying the holographic formulation of self-dual theory to the Ramond-Ramond fields of type II supergravity. We formulate the RR partition function, in the presence of nontrivial H-fields, in terms of the wavefunction of an 11-dimensional Chern-Simons theory. Using the methods of hep-th/0605038 we show how to formulate an action principle for the RR fields of both type IIA and type IIB supergravity, in the presence of RR current. We find a new
topological restriction on consistent backgrounds of type IIA supergravity, namely the fourth Wu class must have a lift to the H-twisted cohomology.
Posted by: KCL