Entropy generation and inflation in wave collision induced pre-big-bang cosmology

Abstract

We study inflation and entropy generation in a recently proposed pre-big-bang model universe produced in a collision of gravitational and dilaton waves. It is shown that enough inflation occurs provided the incoming waves are sufficiently weak. We also find that entropy in this model is dynamically generated as the result of the nonlinear interaction of the incoming waves, before the universe enters the phase of dilaton driven inflation. In particular, we give the scaling of the entropy produced in the collision in terms of the focusing lengths of the incoming waves.

10 pages, latex. 1 postscript figure included. Bound on the incoming focal lengths extended to strong-coupling terminated inflation. Section 3 expanded. Typos corrected and reference added. Final version to appear in Phys. Lett. B

References in corpus (2)

• Firewalls, black-hole thermodynamics, and singular solutions of the Tolman-Oppenheimer-Volkoff equation
• Asymptotic Behaviour of Inhomogeneous String Cosmologies

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