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arXiv:0706.2151 (astro-ph)
[Submitted on 14 Jun 2007 (v1), last revised 2 Aug 2007 (this version, v2)]

Title:Nonlocal Cosmology

Authors:S. Deser (Caltech and Brandeis), R. P. Woodard (U. of Florida)
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Abstract: 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.
Comments: Expanded(!) version, to appear in Phys. Rev. Letters
Subjects: Astrophysics (astro-ph); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Report number: UFIFT-QG-07-03
Cite as: arXiv:0706.2151 [astro-ph]
  (or arXiv:0706.2151v2 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.2151
Journal reference: Phys.Rev.Lett.99:111301,2007
Related DOI: https://doi.org/10.1103/PhysRevLett.99.111301

Submission history

From: Richard Woodard [view email]
[v1] Thu, 14 Jun 2007 16:01:39 UTC (6 KB)
[v2] Thu, 2 Aug 2007 12:41:50 UTC (7 KB)
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