Bouncing universe and non-BPS branes

Abstract

We describe string frame bouncing universe scenarios involving the creation and annihilation of a non-BPS D9-brane in type IIA superstring theory. We find several classes of solutions, in which the bounce is driven by the tachyon dynamics of the non-BPS brane. The metric and the dilaton are consistently described in terms of the lowest order effective action. The bounce solutions interpolate between contracting and expanding pre-big bang (or post-big bang) solutions. The singular behavior of our bounce solutions is the same as that of the pre-big bang (or post-big bang) solution. Upon adding a simple dilaton potential the asymptotic curvature singularity is removed but the dilaton still grows without bound. Such a potential may result from ${\alpha }^{\prime }$ corrections in the open string sector.

arXiv comment18 pages, 12 figures; v2: reference added

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• Rolling Tachyon
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• Exact Solution of a Boundary Conformal Field Theory
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Cited by in corpus (3)

• Dark matter in a bouncing universe
• Effective Action for Cosmological Scalar Fields at Finite Temperature
• Dynamics of scalar fields in an expanding/contracting cosmos at finite temperature