Reheating in the Presence of Noise

Details Reheating in the Presence of Noise Reheating in the Presence of Noise

1997-09-07

arxiv.org/abs/hep-ph/9709273v1

Phys.Rev. D57 (1998) 4651-4662

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, 2 figures, uses LATEX

Scientific paper

10.1103/PhysRevD.57.4651

Explosive particle production due to parametric resonance is a crucial feature of reheating in inflationary cosmology. Coherent oscillations of the inflaton field act as a periodically varying mass in the evolution equation for matter fields which couple to the inflaton. This in turn results in the parametric resonance instability. Thermal and quantum noise will lead to a nonperiodic perturbation in the mass. We study the resulting equation for the evolution of matter fields and demonstrate that noise (at least if it is temporally uncorrelated) will increase the rate of particle production. We also estimate the limits on the magnitude of the noise for which the resonant behavior is qualitatively unchanged.

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