Matter contributions to the expansion rate of the universe

被引：34

作者：

Tsamis, NC ^{[1
]}

Woodard, RP

机构：

[1] Univ Crete, Dept Phys, Heraklion 71003, Crete, Greece

[2] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

来源：

PHYSICS LETTERS B | 1998年 / 426卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(98)00159-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider the effect of various particles on the cosmic expansion rate relative to that of the graviton. Effectively massless fermions, gauge bosons and conformally coupled scalars make only minuscule contributions due to local conformal invariance. Minimally coupled scalars can give much stronger contributions, but they are still sub-dominant to those of gravitons on account of global conformal invariance. Unless effectively massless scaler particles with very particular couplings exist, the leading effect on the expansion rate is furnished solely by the graviton. An upper bound on the mass of such scalar particles is obtained. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：21 / 28

页数：8

共 7 条

[1] INFRARED EFFECTS IN A DE SITTER BACKGROUND [J].