Triangle Seminars
Tuesday, 8 Dec 2009
Aspects of Gauge-Strings duality
Carlos Nunez
(Swansea University)
Abstract:
After an overview of some of the achievements of the AdS/CFT correspondence when applied to realistic field theories, I will describe recent progress in the area.
After an overview of some of the achievements of the AdS/CFT correspondence when applied to realistic field theories, I will describe recent progress in the area.
Posted by: KCL
Wednesday, 9 Dec 2009
The gauge dual of Romans mass
Alessandro Tomasiello
(Universita' di Milano Bicocca)
Abstract:
The Romans mass is a discrete parameter in type IIA string
theory. It is perhaps the most mysterious piece of the theory: for example, its non-perturbative, M-theoretic interpretation is still not known. In this talk, we will review recent efforts to understand it through another non-perturbative tool: holography. We will see how this
parameter modifies the recent holographic interpretation of certain string vacua via Chern-Simons theories. This leads to certain field theory results that, in turn, help find new families of supersymmetric vacua of string theory with negative cosmological constant.
The Romans mass is a discrete parameter in type IIA string
theory. It is perhaps the most mysterious piece of the theory: for example, its non-perturbative, M-theoretic interpretation is still not known. In this talk, we will review recent efforts to understand it through another non-perturbative tool: holography. We will see how this
parameter modifies the recent holographic interpretation of certain string vacua via Chern-Simons theories. This leads to certain field theory results that, in turn, help find new families of supersymmetric vacua of string theory with negative cosmological constant.
Posted by: KCL
Multi-center non-BPS black holes (and what can they teach us about the information paradox)
Iosif Bena
(Paris)
Abstract:
I will review the construction of BPS and non-BPS multicenter black hole solutions, and describe a class of smooth solutions that have the same charges and asymptotics as black holes, but do not have a horizon. I will then discuss some of the properties of these solutions and argue that they should correspond to typical microstates of extremal black holes. If so, string theory would imply that a classical extremal black hole solution is a thermodynamic approximation of an ensemble of horizonless configurations, and that this solution stops giving a valid description of the physics at the scale of the horizon. I will finish by discussing the extension of this to non-extremal black holes and its implications for the information paradox.
I will review the construction of BPS and non-BPS multicenter black hole solutions, and describe a class of smooth solutions that have the same charges and asymptotics as black holes, but do not have a horizon. I will then discuss some of the properties of these solutions and argue that they should correspond to typical microstates of extremal black holes. If so, string theory would imply that a classical extremal black hole solution is a thermodynamic approximation of an ensemble of horizonless configurations, and that this solution stops giving a valid description of the physics at the scale of the horizon. I will finish by discussing the extension of this to non-extremal black holes and its implications for the information paradox.
Posted by: KCL