Theory Seminar
KEK 慺棻巕尨巕妀尋媶強丒棟榑僙儈僫乕
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TITLE丗 |
DILATON COSMOLOGIES AND THEIR GAUGE THEORY
DUALS |
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乮in English) |
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SPEAKER丗 |
Professor Sumit R. Das (University of Kentucky) |
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DATE丗 |
February 2 (Tue.) 11:00-12:00 |
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PLACE: |
Laboratory No.4, Room 345 |
丂丂丂 乮ABSTRACT乯
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.