Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-12-07
Phys.Rev. D67 (2003) 106003
Physics
High Energy Physics
High Energy Physics - Theory
35 pages, 5 figures. v2: typos corrected, references added
Scientific paper
10.1103/PhysRevD.67.106003
We analyze the structure of supersymmetric Godel-like cosmological solutions of string theory. Just as the original four-dimensional Godel universe, these solutions represent rotating, topologically trivial cosmologies with a homogeneous metric and closed timelike curves. First we focus on "phenomenological" aspects of holography, and identify the preferred holographic screens associated with inertial comoving observers in Godel universes. We find that holography can serve as a chronology protection agency: The closed timelike curves are either hidden behind the holographic screen, or broken by it into causal pieces. In fact, holography in Godel universes has many features in common with de Sitter space, suggesting that Godel universes could represent a supersymmetric laboratory for addressing the conceptual puzzles of de Sitter holography. Then we initiate the investigation of "microscopic" aspects of holography of Godel universes in string theory. We show that Godel universes are T-dual to pp-waves, and use this fact to generate new Godel-like solutions of string and M-theory by T-dualizing known supersymmetric pp-wave solutions.
Boyda Edward
Ganguli Surya
Horava Petr
Varadarajan Uday
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