Nonlocal cosmology

被引：323
|
作者：
Deser, S. [1 ]
Woodard, R. P.
机构：
[1] CALTECH, Pasadena, CA 91125 USA
[2] Brandeis Univ, Dept Phys, Waltham, MA 02454 USA
[3] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 11期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevLett.99.111301
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We explore nonlocally modified models of gravity, inspired by quantum loop corrections, as a mechanism for explaining current cosmic acceleration. These theories enjoy two major advantages: they allow a delayed response to cosmic events, here the transition from radiation to matter dominance, and they avoid the usual level of fine-tuning; instead, emulating Dirac's dictum, the required large numbers come from the large time scales involved. Their solar system effects are safely negligible, and they may even prove useful to the black hole information problem.
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