| Speaker: | Sumit Das (Kentucky University) |
|---|---|
| Title: | DILATON COSMOLOGIES AND THEIR GAUGE THEORY DUALS |
| Date (JST): | Tue, Jan 12, 2010, 13:15 - 14:45 |
| Place: | Seminar Room at IPMU Prefab. B |
| Related File: | 207.pdf |
| Abstract: |
We discuss deformations of AdS_5 X S5 obtained by taking the boundary value of the dilaton to be time dependent. This background is dual to N=4 Yang-Mills with 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 AdS_5 X S5, but with possible presence of small black holes. |
| Contact: | Sugimoto |
