Reheating and dangerous relics in pre-big-bang string cosmology

Alessandra Buonanno, Martin Lemoine, Keith A. Olive

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We discuss the mechanism of reheating in pre-big-bang string cosmology and we calculate the amount of moduli and gravitinos produced gravitationally and in scattering processes of the thermal bath. We find that this abundance always exceeds the limits imposed by big-bang nucleosynthesis, and significant entropy production is required. The exact amount of entropy needed depends on the details of the high curvature phase between the dilaton-driven inflationary era and the radiation era. We show that the domination and decay of the zero-mode of a modulus field, which could well be the dilaton, or of axions, suffices to dilute moduli and gravitinos. In this context, baryogenesis can be accommodated in a simple way via the Affleck-Dine mechanism and in some cases the Affleck-Dine condensate could provide both the source of entropy and the baryon asymmetry.

Original languageEnglish (US)
Article number083513
Pages (from-to)1-17
Number of pages17
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume62
Issue number8
StatePublished - Oct 15 2000

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