Ultralight particle creation during Fresh inflation

MAURICIO BELLINI

NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA B-GENERAL PHYSICS RELATIVITY ASTRONOMY AND MATHEMATICAL PHYSICS AND METHODS

Societá Italiana di Física

Lugar: Bologna; Año: 2002 vol. 117 p. 653 - 658

0369-3554

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 ∼ tp). Ultralight boson fields created during fresh inflation could be an alternative mechanism to cosmological constant to explain the discrepancy between the observed m ≃ 0.2 and tot ≃ 1, predicted by inflationary models.