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

页码：173 / 177

页数：5

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