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Published August 15, 2001 | public
Journal Article Open

Fate of classical tensor inhomogeneities in pre-big-bang string cosmology

Abstract

In pre-big-bang string cosmology one uses a phase of dilaton-driven inflation to stretch an initial (microscopic) spatial patch to the (much larger) size of the big-bang fireball. We show that the dilaton-driven inflationary phase does not naturally iron out the initial classical tensor inhomogeneities unless the initial value of the string coupling is smaller than gin≲10^-35.

Additional Information

©2001 The American Physical Society Received 26 February 2001; published 6 July 2001 We are grateful to Gabriele Veneziano for useful conversations and stimulating comments concerning the homogeneity problem in ordinary inflation. We thank David Langlois and Maurizio Gasperini for useful conversations and/or remarks. A.B.'s research was supported by the Caltech's Richard Chace Tolman Fund and by NSF Grant No. AST-9731698 and NASA Grant No. NAG5-6840.

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