Exponential gravity

被引：203

作者：

Linder, Eric V. ^{[1
,2
,3
]}

机构：

[1] Berkeley Lab, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Berkeley, CA 94720 USA

[3] Ewha Womans Univ, Inst Early Universe, Seoul, South Korea

来源：

PHYSICAL REVIEW D | 2009年 / 80卷 / 12期

关键词：

D O I：

10.1103/PhysRevD.80.123528

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate a f(R) modification of gravity that is exponential in the Ricci scalar R to explain cosmic acceleration. The steepness of this dependence provides extra freedom to satisfy solar system and other curvature regime constraints. With a parameter to alleviate the usual fine-tuning of having the modification strengthen near the present, the total number of parameters is only one more than Lambda CDM. The resulting class of solutions asymptotes to w=-1 but has no cosmological constant. We calculate the dynamics in detail, examine the effect on the matter power spectrum, and provide a simple fitting form relating the two.

引用

页数：6

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