An alternative approach to tachyon cosmology

Details An alternative approach to tachyon cosmology An alternative approach to tachyon cosmology

2008-12-31

arxiv.org/abs/0901.0080v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages. References added

Scientific paper

In this note we propose the use of an alternate action for the open string tachyon on a non-BPS $D3$-brane. At the classical level this action is precisely equivalent to the more commonly used DBI action, but involves an additional coupling to dynamical world-volume gravity. We find that, for a FRW metric, exponential expansion occurs provided that the cosmological constant is positive. For anti de-Sitter solutions we find a periodically bouncing universe, and there are no accelerating trajectories for a theory with no cosmological constant. In specific cases the acceleration is terminated by the condensation of the open string tachyon, leading to a canonical inflationary trajectory at late times.

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