Awad, Adel ; Das, Sumit R. ; Narayan, K. ; Trivedi, Sandip P. (2008) Gauge theory duals of cosmological backgrounds and their energy momentum tensors Physical Review D, 77 (4). 046008_1-046008_9. ISSN 0556-2821
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Official URL: http://prd.aps.org/abstract/PRD/v77/i4/e046008
Related URL: http://dx.doi.org/10.1103/PhysRevD.77.046008
Abstract
We revisit type IIB supergravity backgrounds with null and spacelike singularities with natural gauge theory duals proposed in [S.R. Das, J. Michelson, K. Narayan, and S.P. Trivedi, Phys. Rev. D 74, 026002 (2006)] and [S.R. Das, J. Michelson, K. Narayan, and S.P. Trivedi, Phys. Rev. D 75, 026002 (2007)]. We show that for these backgrounds there are always choices of the boundaries of these deformed AdS5×S5 space-times, such that the dual gauge theories live on flat metrics and have space-time dependent couplings. We present a new time dependent solution of this kind where the effective string coupling is always bounded and vanishes at a spacelike singularity in the bulk, and the space-time becomes AdS5×S5 at early and late times. The holographic energy momentum tensor calculated with a choice of flat boundary is shown to vanish for null backgrounds and to be generically nonzero for time dependent backgrounds.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Physical Society. |
ID Code: | 8723 |
Deposited On: | 28 Oct 2010 05:02 |
Last Modified: | 16 May 2016 18:39 |
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