Fermion production during preheating after hybrid inflation

Details Fermion production during preheating after hybrid inflation Fermion production during preheating after hybrid inflation

2000-02-07

arxiv.org/abs/hep-ph/0002076v2

JHEP 0002 (2000) 034

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 14 figures, uses epsfig and JHEP macros (included)

Scientific paper

10.1088/1126-6708/2000/02/034

At the end of inflation, the coherent oscillations of the inflaton field may resonantly amplify the long wavelength modes of both bosons and fermions coupled to it. We study the resonant production of both kinds of particles during preheating in a model of hybrid inflation. The coherent time evolution of the inflaton and the Higgs fields after inflation induce a very different production of fermions depending on whether they are coupled to the Higgs or to the inflaton. For reasonable values of the model parameters, the fermion production through parametric resonance can be very efficient. We study the relative growth of the fermion and boson energy densities during preheating in hybrid models. During the initial stage of preheating, fermion production dominates the relative energy density, while the exponential growth of bosonic modes soon takes over.

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