Superstring Cosmology

Details Superstring Cosmology Superstring Cosmology

1999-09-10

arxiv.org/abs/hep-th/9909061v2

Phys.Rept. 337 (2000) 343-492

Physics

High Energy Physics

High Energy Physics - Theory

161 pages, latex with epsf, 15 figures. Minor changes, additional references and figures. Version to appear in Physics Reports

Scientific paper

10.1016/S0370-1573(00)00064-8

Aspects of superstring cosmology are reviewed with an emphasis on the cosmological implications of duality symmetries in the theory. The string effective actions are summarized and toroidal compactification to four dimensions reviewed. Global symmetries that arise in the compactification are discussed and the duality relationships between the string effective actions are then highlighted. Higher-dimensional Kasner cosmologies are presented and interpreted in both string and Einstein frames, and then given in dimensionally reduced forms. String cosmologies containing both non-trivial Neveu-Schwarz/Neveu-Schwarz and Ramond-Ramond fields are derived by employing the global symmetries of the effective actions. Anisotropic and inhomogeneous cosmologies in four-dimensions are also developed. The review concludes with a detailed analysis of the pre-big bang inflationary scenario. The generation of primordial spectra of cosmological perturbations in such a scenario is discussed. Possible future directions offered in the Horava-Witten theory are outlined.

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