Dynamics of Nonlocal Cosmology

Details Dynamics of Nonlocal Cosmology Dynamics of Nonlocal Cosmology

2008-03-24

arxiv.org/abs/0803.3399v2

Phys.Rev.D77:123513,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, 3 figures. V2: minor corrections

Scientific paper

10.1103/PhysRevD.77.123513

Nonlocal quantum corrections to gravity have been recently proposed as a possible solution to the cosmological fine tuning problems. We study the dynamics of a class of nonlocal actions defined by a function of the inverse d'Alembertian of the Ricci scalar. Power-law and expnential functions are considered in detail, but we also show a method to reconstruct a nonlocal correction that generates a given background expansion. We find that even the simplest terms can, while involving only Planck scale constants, drive the late time acceleration without changing early cosmology. This leads to a sudden future singularity, which however may be avoided by regularizing the d'Alembertian. We also consider the Einstein frame versions of these models.

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