Tachyonic Inflation in a Warped String Background

Details Tachyonic Inflation in a Warped String Background Tachyonic Inflation in a Warped String Background

2004-06-22

arxiv.org/abs/hep-th/0406195v2

JHEP0410:057,2004

Physics

High Energy Physics

High Energy Physics - Theory

Latex, JHEP class, 20 pages, 4 figures. v2: references added, small error in section 7 corrected, published version

Scientific paper

10.1088/1126-6708/2004/10/057

We analyze observational constraints on the parameter space of tachyonic inflation with a Gaussian potential and discuss some predictions of this scenario. As was shown by Kofman and Linde, it is extremely problematic to achieve the required range of parameters in conventional string compactifications. We investigate if the situation can be improved in more general compactifications with a warped metric and varying dilaton. The simplest examples are the warped throat geometries that arise in the vicinity of of a large number of space-filling D-branes. We find that the parameter range for inflation can be accommodated in the background of D6-branes wrapping a three-cycle in type IIA. We comment on the requirements that have to be met in order to realize this scenario in an explicit string compactification.

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