Nonlocal Cosmology

Details Nonlocal Cosmology Nonlocal Cosmology

2007-06-14

arxiv.org/abs/0706.2151v2

Phys.Rev.Lett.99:111301,2007

Astronomy and Astrophysics

Astrophysics

Expanded(!) version, to appear in Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.99.111301

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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