Chiang-Mei Chen et al JHEP10(2003)058 doi:10.1088/1126-6708/2003/10/058
Chiang-Mei Chen1, Pei-Ming Ho1, Ishwaree P. Neupane1, John E. Wang1 and Nobuyoshi Ohta2
Show affiliationsWe present a systematic study of accelerating cosmologies obtained from M/string theory compactifications of hyperbolic spaces with time-varying volume. A set of vacuum solutions where the internal space is a product of hyperbolic manifolds is found to give qualitatively the same accelerating four-dimensional FLRW universe behavior as a single hyperbolic space. We also examine the possibility that our universe is a hyperbolic space and provide exact Milne type solutions, as well as intersecting S-brane solutions. When both the usual 4D spacetime and the m-dimensional internal space are hyperbolic, we find eternally accelerating cosmologies for m ≥ 7, with and without form field backgrounds. In particular, the effective potential for a magnetic field background in the large 3 dimensions is positive definite with a local minimum and thus enhances the eternally accelerating expansion.
E-print Number: hep-th/0306291
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11.27.+d Extended classical solutions; cosmic strings, domain walls, texture
Issue 10 (October 2003)
Received 22 July 2003, accepted for publication 24 October 2003
Published 13 November 2003
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