{
  "id": "0711.2994",
  "version": "v2",
  "published": "2007-11-19T18:50:38.000Z",
  "updated": "2007-11-27T15:05:11.000Z",
  "title": "Gauge Theory Duals of Cosmological Backgrounds and their Energy Momentum Tensors",
  "authors": [
    "Adel Awad",
    "Sumit R. Das",
    "K. Narayan",
    "Sandip P. Trivedi"
  ],
  "comment": "17 pages, LaTeX, v2: minor modifications",
  "journal": "Phys.Rev.D77:046008,2008",
  "doi": "10.1103/PhysRevD.77.046008",
  "categories": [
    "hep-th"
  ],
  "abstract": "We revisit Type IIB supergravity backgrounds with null and spacelike singularities with natural gauge theory duals proposed in {\\tt hep-th/0602107} and {\\tt hep-th/0610053}. We show that for these backgrounds there are always choices of the boundaries of these deformed $AdS_5 \\times S^5$ space-times, such that the dual gauge theories live on {\\it 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 $AdS_5 \\times S^5$ 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 non-zero for time dependent backgrounds.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2007-11-27T15:05:11.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "11.25.Tq",
      "98.80.Bp"
    ],
    "keywords": [
      "cosmological backgrounds",
      "energy momentum tensor",
      "revisit type iib supergravity backgrounds",
      "time dependent",
      "natural gauge theory duals"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review D",
      "year": 2008,
      "month": "Feb",
      "volume": 77,
      "number": 4,
      "pages": "046008"
    },
    "note": {
      "typesetting": "LaTeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 768056,
      "adsabs": "2008PhRvD..77d6008A"
    }
  }
}