Dynamics of nonlocal cosmology

By Tomi Koivisto. 2008

141 citations recorded by the source corpus.

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 the function of the inverse d'Alembertian of the Ricci scalar. Power-law and exponential 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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/d9d0cc90bf527f4f296793d56209fffc14de1522

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In Astronomy and Astrophysics

In Nuclear and High Energy Physics

In Statistical and Nonlinear Physics

Citations in the corpus

Dynamical systems applied to cosmology: Dark energy and modified gravity (2017, methodology): “Koivisto (2008) used dynamical systems techniques to analyse power-law and exponential forms of the nonlocal term in FLRW cosmology.”