Triangle Seminars
Thursday, 13 May 2010
Higher Derivative Gravity and AdS/CFT
Manuela Kulaxizi
(Amsterdam)
Abstract:
We will discuss a special class of higher derivative gravity theories called Lovelock gravities, in the context of holography. For a generic Lovelock gravity in arbitrary dimensions, we will formulate the existence condition for asymptotically AdS black holes. Then, causality of the dual finite temperature CFT will be shown to impose constraints on the Lovelock parameters. Calculation of the holographic Weyl anomaly in 6+1 dimensions reveals that these constraints are completely equivalent to the ones determined by requiring positivity of the energy flux. Implications of these results on the viscosity to entropy bound will also be discussed. This talk is based on hep-th/0910.5347, 0912.1877, 0912.4244.
We will discuss a special class of higher derivative gravity theories called Lovelock gravities, in the context of holography. For a generic Lovelock gravity in arbitrary dimensions, we will formulate the existence condition for asymptotically AdS black holes. Then, causality of the dual finite temperature CFT will be shown to impose constraints on the Lovelock parameters. Calculation of the holographic Weyl anomaly in 6+1 dimensions reveals that these constraints are completely equivalent to the ones determined by requiring positivity of the energy flux. Implications of these results on the viscosity to entropy bound will also be discussed. This talk is based on hep-th/0910.5347, 0912.1877, 0912.4244.
Posted by: QMW
Friday, 14 May 2010
Non-Gaussianity as a Probe of Fundamental Physics
Yi Wang
(McGill)
Abstract:
Non-Gaussianity, which denotes the non-Gaussian feature of
the CMB temperature fluctuation, is potentially the most promising
probe of inflation. In this talk, we discuss some recent research
topics in this field, namely non-Gaussianity for DBI inflation,
quasi-single field inflation and multi-stream inflation. Special
attention is paid on the relation between non-Gaussianity and string
theory.
Non-Gaussianity, which denotes the non-Gaussian feature of
the CMB temperature fluctuation, is potentially the most promising
probe of inflation. In this talk, we discuss some recent research
topics in this field, namely non-Gaussianity for DBI inflation,
quasi-single field inflation and multi-stream inflation. Special
attention is paid on the relation between non-Gaussianity and string
theory.
Posted by: QMW