Multi-field fermionic preheating

Details Multi-field fermionic preheating Multi-field fermionic preheating

2000-06-30

arxiv.org/abs/hep-ph/0006354v2

JHEP 0008 (2000) 019

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 15 figures. Submitted to JHEP. New inset to Figure 2

Scientific paper

10.1088/1126-6708/2000/08/019

Fermion creation during preheating in the presence of multiple scalar fields exhibits a range of interesting behaviour relevant to estimating post-inflation gravitino abundances. We present non-perturbative analysis of this phenomenon over a 6-dimensional parameter space in an expanding background paying particular attention to the interplay between instant and direct fermion preheating. In the broad resonance regime we find that instant fermion production is sensitive to suppression of the long wavelength scalar field modes during inflation. Further, the standard scenario of resonant fermionic preheating through inflaton decay can be significantly modified by instant preheating, and may even lead to a decrease in the number of fermions produced. We explicitly include the effects of metric perturbations and demonstrate that they are important at small coupling but not at strong coupling, due to the rapid saturation of the Pauli bound.

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