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

Abstract

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.

6 pages

References in corpus (2)

• Fate of oscillating scalar fields in the thermal bath and their cosmological implications
• Particle abundance in a thermal plasma: quantum kinetics vs. Boltzmann equation

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