Ultralight particle creation during fresh inflation

Details Ultralight particle creation during fresh inflation Ultralight particle creation during fresh inflation

2002-08-19

arxiv.org/abs/gr-qc/0208058v2

Nuovo Cim.B117:653-658,2002

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, 2 figures (to appear in Il Nuovo Cimento B)

Scientific paper

I study ultralight particle creation which becomes from the Yukawa interaction between the inflaton and the thermal bath during fresh inflation. Particle creation is important in the first stages of fresh inflation, when the nonequilibrium thermal effects are important. I find that the number density of the ultralight created particles is more important as the scale factor growth rate is more large (i.e., for $p$ large -- $a \sim t^p$). Ultralight boson fields created during fresh inflation could be an alternative mechanism to cosmological constant to explain the discrepancy between the observed $\Omega_m \simeq 0.2$ and $\Omega_{tot} \simeq 1$, predicted by inflationary models.

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