Massive fermion production in nonsingular superstring cosmology

Details Massive fermion production in nonsingular superstring cosmology Massive fermion production in nonsingular superstring cosmology

2001-03-14

arxiv.org/abs/hep-ph/0103148v1

Phys.Rev. D64 (2001) 023519

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures

Scientific paper

10.1103/PhysRevD.64.023519

We study massive spin-1/2 fermion production in nonsingular superstring cosmology, taking into account one-loop quantum corrections to a superstring effective action with dilaton and modulus fields. While no creation occurs in the massless limit, massive fermions can be produced by the existence of a time-dependent frequency. Due to the increase of the Hubble expansion rate during the modulus-driven phase, the occupation of number of fermions continues to grow until the point of the graceful exit, after which fermion creation ceases with the decrease of the Hubble rate.

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