Evolution of cosmological perturbations during reheating

被引:53
作者
Hamazaki, T [1 ]
Kodama, H [1 ]
机构
[1] KYOTO UNIV, YUKAWA INST THEORET PHYS, KYOTO 60601, JAPAN
来源
PROGRESS OF THEORETICAL PHYSICS | 1996年 / 96卷 / 06期
关键词
D O I
10.1143/PTP.96.1123
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The behavior of scalar perturbations on superhorizon scales during the reheating stage is investigated by replacing the rapidly oscillating inflaton field by a perfect fluid obtained by the spacetime averaging and the WKB approximation. The influence of the energy transfer from the inflaton to radiation on the evolution of the Bardeen parameter is examined for realistic reheating processes. It is shown that the entropy perturbation generated by the energy transfer is negligibly small, and therefore the Bardeen parameter is conserved with good accuracy during reheating. This justifies the conventional prescription relating the amplitudes of quantum fluctuations during inflation and those of adiabatic perturbations at horizon crossing in the post-Friedmann stage.
引用
收藏
页码:1123 / 1145
页数:23
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