More on Tachyon Cosmology in De Sitter Gravity

Details More on Tachyon Cosmology in De Sitter Gravity More on Tachyon Cosmology in De Sitter Gravity

2005-05-02

arxiv.org/abs/hep-th/0505012v3

JHEP 0601 (2006) 071

Physics

High Energy Physics

High Energy Physics - Theory

15pp, 3 figures; references added

Scientific paper

10.1088/1126-6708/2006/01/071

We aim to study rolling tachyon cosmological solutions in de Sitter gravity. The solutions are taken to be flat FRW type and these are not time-reversal symmetric. We find that cosmological constant of our universe has to be fine-tuned at the level of the action itself, as in KKLT string compactification. The rolling tachyon can give rise to required inflation with suitable choice of the initial conditions which include nonvanishing Hubble constant. We also determine an upper bound on the volume of the compactification manifold.

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