Null orbifolds in AdS , Time Dependence and Holography

  title={Null orbifolds in AdS , Time Dependence and Holography},
  author={Joan Sim{\'o}n},
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 Poincaré patches. To deal with their usual horizons, we either extend these models to global AdS or remain in the Poincaré 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… CONTINUE READING
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