Remarks on Tachyon Driven Cosmology

Details Remarks on Tachyon Driven Cosmology Remarks on Tachyon Driven Cosmology

2003-12-13

arxiv.org/abs/hep-th/0312153v2

Phys.Scripta T117:70-75,2005

Physics

High Energy Physics

High Energy Physics - Theory

Talk at Nobel Symposium on Cosmology and String Theory and IIT Kanpur workshop on String Theory; v2: references added

Scientific paper

10.1238/Physica.Topical.117a0005

We begin by reviewing the results on the decay of unstable D-branes in type II string theory, and the open-closed string duality proposal that arises from these studies. We then apply this proposal to the study of tachyon driven cosmology, namely cosmological solutions describing the decay of unstable space filling D-branes. This naturally gives rise to a time reversal invariant bounce solution with positive spatial curvature. In the absence of a bulk cosmological constant the universe always begins with a big bang and ends in a big crunch. In the presence of a bulk cosmological constant one may get non-singular cosmological solutions for some special range of initial conditions on the tachyon.

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