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Dynamics of Nonlocal Cosmology
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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.
Forward citations
Cited by 2 Pith papers
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Nonlocal gravity in a proper tetrad frame: traversable wormholes
Static, spherically symmetric traversable wormholes are built in revised Deser-Woodard nonlocal gravity by reconstructing the theory's distortion function from chosen wormhole metrics.
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Nonlocal four-fermion theory
Hyperbolic Dirac form factors lower the critical coupling for dynamical mass generation in a nonlocal NJL/GN model, while oscillatory form factors raise it.
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