Authors: Dimitrijevic, I.
Dragovich, B.
Rakic, Z.
Stankovic, J.
Title: Cosmological Solutions of Some Nonlocal Gravity Models
Journal: Proceedings of the Steklov Institute of Mathematics
Volume: 306
Issue: 1
First page: 66
Last page: 73
Issue Date: 1-Sep-2019
ISSN: 00815438
DOI: 10.1134/S0081543819050079
URL: https://api.elsevier.com/content/abstract/scopus_id/85077363414
Abstract: 
© 2019, Pleiades Publishing, Ltd. Significant phenomenological success and nice theoretical properties of general relativity (GR) are well known. However, GR is not a complete theory of gravity. Hence, there are many attempts to modify GR. One of the current approaches to a more complete theory of gravity is a nonlocal modification of GR. The nonlocal gravity approach, which we consider here without matter, is based on the action S=(16πG)−1∫−g(R−2Λ+P(R)ℱ(□)Q(R))d4x, where R is the scalar curvature, Γ is the cosmological constant, P(R) and Q(R) are some differentiable functions of R, and ℱ(□)=∑n=1+∞fn□n is an analytic function of the corresponding d’Alembert operator □. We present here a brief review of some general properties and cosmological solutions for some specific functions P(R) and Q(R).

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