| DATE: |
2010-02-02 11:00 - 12:00 |
| PLACE: |
4 Go-Kan Rm. 345 |
| TITLE: |
DILATON COSMOLOGIES AND THEIR GAUGE THEORY DUALS |
| CONTACT: |
HYAKUTAKE Yoshifumi, hyaku AT post.kek.jp |
| SPEAKER: |
Professor Sumit R. Das (University of Kentucky) |
| LANGUAGE: |
English |
| ABSTRACT: |
We discuss deformations of AdS5 X S5 obtained by taking the boundary value of the dilaton to be time dependent. This background is dual to N=4 Yang-Millswith a time dependent 't Hooft coupling. The coupling asymptotes to a large constant value in the far past and far future and attains a small value at an intermediate time. At this time, the bulk curvature becomes large and supergravity breaks down - this appears like a space-like singularity. We use the dual gauge theory to ask if a meaningful time evolution exists beyond this time and show how a coherent state adiabatic approximation can be used to address this issue when the coupling is slowly varying. We argue that the final state should have a dual description which is mostly smooth AdS5 X S5, but with possible presence of small black holes. |
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