Exponential gravity

被引：199
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.
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页数：6
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