Can oscillating scalar fields decay into particles with a large thermal mass?

Details Can oscillating scalar fields decay into particles with a large thermal mass? Can oscillating scalar fields decay into particles with a large thermal mass?

2005-10-07

arxiv.org/abs/hep-ph/0510091v1

Phys.Lett. B635 (2006) 66-71

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages

Scientific paper

10.1016/j.physletb.2006.02.039

We calculate the dissipation rate of a coherently oscillating scalar field in a thermal environment using nonequilibrium quantum field theory and apply it to the reheating stage after cosmic inflation. It is shown that the rate is nonvanishing even when particles coupled to the oscillating inflaton field have a larger thermal mass than it, and therefore the cosmic temperature can be much higher than inflaton's mass even in the absence of preheating. Its cosmological implications are also discussed.

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