1996/08/27 by S. Yu. Khlebnikov, S.Yu. Khlebnikov, I. I. Tkachev +1 · 4 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1016/s0370-2693(96)01419-0
published as Phys.Lett. B390 (1997) 80-86 · LaTeX, 12 pages including 3 figures
arxiv created 1996/08/27 · openalex publication_date 1997/01/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study numerically the decay of massive and massless inflatons into massive excitations, via a ϕ2 X2 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 108. 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 λϕ4/4 potential, the Universe expansion completely prevents a resonance production of particles with masses larger than √λϕ(0) for q up to q=106.