Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-08-27
Phys.Lett. B390 (1997) 80-86
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 12 pages including 3 figures
Scientific paper
10.1016/S0370-2693(96)01419-0
We study numerically the decay of massive and massless inflatons into massive excitations, via a $\phi^2 X^2$ 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 $q$, $q\gsim 10^8$. For these large $q$, 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 $\lambda\phi^4/4$ potential, the Universe expansion completely prevents a resonance production of particles with masses larger than $\sqrt{\lambda}\phi(0)$ for $q$ up to $q=10^6$.
Khlebnikov Yu. S.
Tkachev Igor I.
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