Delayed Reheating and the Breakdown of Coherent Oscillations

Details Delayed Reheating and the Breakdown of Coherent Oscillations Delayed Reheating and the Breakdown of Coherent Oscillations

2010-03-15

arxiv.org/abs/1003.3011v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

18 pages, 5 figures, v2: references added, extended discussion in section 3

Scientific paper

We analyze the evolution of the perturbations in the inflaton field and metric following the end of inflation. We present accurate analytic approximations for the perturbations, showing that the coherent oscillations of the post-inflationary condensate necessarily break down long before any current phenomenological constraints require the universe to become radiation dominated. Further, the breakdown occurs on length-scales equivalent to the comoving post-inflationary horizon size. This work has implications for both the inflationary "matching" problem, and the possible generation of a stochastic gravitational wave background in the post-inflationary universe.

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