Cosmology of non-local f(R) gravity
High Energy Physics - Theory
2019-08-05 v2 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
Abstract
We consider a modification of GR with a special type of a non-local f(R). The structure of the non-local operators is motivated by the string field theory and p-adic string theory. The spectrum is derived explicitly and the ghost-free condition for the model is formulated. We pay special attention to the classical stability of the de Sitter solution in our model and formulate the conditions on the model parameters to have a stable configuration. Relevance of unstable configurations for the description of the de Sitter phase during inflation is specifically discussed.
Keywords
Cite
@article{arxiv.1509.04254,
title = {Cosmology of non-local f(R) gravity},
author = {I. Dimitrijevic and B. Dragovich and A. S. Koshelev and Z. Rakic and J. Stankovic},
journal= {arXiv preprint arXiv:1509.04254},
year = {2019}
}
Comments
16 pages; new version matches the published one and contains substantial improvements in the discussion of the physics of the new model