Preheating in FRW Universes

Details Preheating in FRW Universes Preheating in FRW Universes

1996-09-30

arxiv.org/abs/hep-ph/9609527v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, RevTex, 2 epsf figures

Scientific paper

The nonlinear time evolution of the quantum fields is studied in the O(N) model for large N in a radiation dominated FRW universe, with a view towards the phenomenon of explosive particle production due to either spinodal instabilities or parametric amplification, i.e. preheating. Quantum backreaction effects due to the produced particles are included consistently within the large N approximation. We find that preheating persists when the expansion is included, although the amount of particle production is reduced compared to the values found in Minkowski space. We also see that the behavior of the evolving zero mode is very different from that in Minkowski space, though the late time behavior in all cases is determined by a sum rule that implies the existence of Goldstone bosons in the final state.

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