Null orbifolds in AdS, Time Dependence and Holography

Details Null orbifolds in AdS, Time Dependence and Holography Null orbifolds in AdS, Time Dependence and Holography

2002-08-22

arxiv.org/abs/hep-th/0208165v1

JHEP 0210 (2002) 036

Physics

High Energy Physics

High Energy Physics - Theory

1+25 pages, no figures

Scientific paper

10.1088/1126-6708/2002/10/036

We study M/D-branes in a null-brane background. By taking a near horizon limit, one is left with cosmological models in the corresponding Poincar\'e patches. To deal with their usual horizons, we either extend these models to global AdS or remain in the Poincar\'e patch and apply a T-duality transformation whenever the effective radius of the compact dimension associated with the null-brane probes distances smaller than the string scale. The first scenario gives rise to null orbifolds in AdS spaces, which are described in detail. Their conformal boundaries are singular. The second has a dual gauge theory description in terms of Super Yang-Mills in the null-brane background. The latter is a good candidate for a non-perturbative definition of string theory in a time-dependent background.

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