The Universe after inflation: the wide resonance case
arXiv:hep-ph/9608458 · doi:10.1016/S0370-2693(96)01419-0
Abstract
We study numerically the decay of massive and massless inflatons into massive excitations, via a coupling, in the expanding Universe. We find that a wide enough resonance can survive the Universe expansion, though account for the expansion is very important for determining precisely how wide it should be. For a massive inflaton, the effective production of particles with mass ten times that of the inflaton requires very large values of the resonance parameter , $q\gsim 10^8$. For these large , the maximal size of produced fluctuations is significantly suppressed by the back reaction, but at least within the Hartree approximation they are still not negligible. For the massless inflaton with a potential, the Universe expansion completely prevents a resonance production of particles with masses larger than for up to .
LaTeX, 12 pages including 3 figures
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