The Universe after inflation: The Wide resonance case
Aug, 199612 pages
Published in:
- Phys.Lett.B 390 (1997) 80-86
e-Print:
- hep-ph/9608458 [hep-ph]
Report number:
- PURD-TH-96-06,
- OSU-TA-20-96
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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 .- 98.80.Cq
- 05.70.Fh
- inflation
- postulated particle: inflaton
- decay: inflaton
- resonance
- particle: production
- Hartree approximation
- field theory: fluctuation
- effect: back reaction
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