Gauge invariant metric perturbations during reheating.

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: 2001 vol. 116 p. 945 - 950

0369-3554

The possible amplification of gauge invariant metric fluctuations in the infrared sector are very important during reheating stage of inflation. In this stage the inflaton field oscillates around the minimum of the scalar potential. The evolution for the super Hubble scales gauge invariant metric fluctuations can be studied by means of the Bardeen parameter. For a massive scalar field with potential V (c) = m2 2 2c +  with nonzero cosmological constant. I find that (in the reheating regime and for super Hubble scales) the Sasaki-Mukhanov parameter oscillates with amplitude constant such that there is not amplification of Q during reheating.