Hubble induced mass in radiation-dominated universe

被引：17
|
作者：
Kawasaki, Masahiro [1 ,2 ]
Takesako, Tomohiro [1 ]
机构：
[1] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan
[2] Univ Tokyo, Inst Phys & Math Universe, Kashiwa, Chiba 2778568, Japan
来源：
PHYSICS LETTERS B | 2012年 / 711卷 / 02期
关键词：
D O I：
10.1016/j.physletb.2012.03.069
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We reconsider the effective mass of a scalar field which interact with visible sector via Planck-suppressed coupling in supergravity framework. We focus on the radiation-dominated (RD) era after inflation. In this era, the effective mass is given by thermal average of interaction terms. To make our analysis clear, we rely on Kadanoff-Baym equations to evaluate the thermal average. We find that, in RD era, a scalar field acquires the effective mass of the order of H. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：173 / 177
页数：5
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