Remarks on tachyon driven cosmology
Dec, 200316 pages
Part of Proceedings, Nobel Symposium 127 on String theory and cosmology : Sigtuna, Sweden, August 14-19, 2003, 70-75
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- Phys.Scripta T 117 (2005) 70-75
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- hep-th/0312153 [hep-th]
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Abstract:
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.Note:
- Talk at Nobel Symposium on Cosmology and String Theory and IIT Kanpur workshop on String Theory: v2: references added
- 11.25.-w
- 98.80.-k
- talk: Kanpur 2003/12/08
- talk: Sigtunastiftelsen 2003/08/14
- cosmological model
- tachyon
- membrane model: D-brane
- membrane: decay
- string model
- cosmological constant
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