Abstract
We study all four types of finite-time future singularities emerging in the late-time accelerating (effective quintessence/phantom) era from ℱ(R,G)-gravity, where R and G are the Ricci scalar and the Gauss–Bonnet invariant, respectively. As an explicit example of ℱ(R,G)-gravity, we also investigate modified Gauss–Bonnet gravity, so-called F(G)-gravity. In particular, we reconstruct the F(G)-gravity and ℱ(R,G)-gravity models where accelerating cosmologies realizing the finite-time future singularities emerge. Furthermore, we discuss a possible way to cure the finite-time future singularities in F(G)-gravity and ℱ(R,G)-gravity by taking into account higher-order curvature corrections. The example of non-singular realistic modified Gauss–Bonnet gravity is presented. It turns out that adding such non-singular modified gravity to singular Dark Energy makes the combined theory a non-singular one as well.
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Bamba, K., Odintsov, S.D., Sebastiani, L. et al. Finite-time future singularities in modified Gauss–Bonnet and ℱ(R,G) gravity and singularity avoidance. Eur. Phys. J. C 67, 295–310 (2010). https://doi.org/10.1140/epjc/s10052-010-1292-8
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DOI: https://doi.org/10.1140/epjc/s10052-010-1292-8