Viscous fluids and Gauss–Bonnet modified gravity

Author： Gorbunova Olesya   Sebastiani Lorenzo  

Publisher： Springer Publishing Company

ISSN： 0001-7701

Source： General Relativity and Gravitation, Vol.42, Iss.12, 2010-12, pp. : 2873-2890

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

We study effects of cosmic fluids on finite-time future singularities in modified f (R, G)-gravity, where R and G are the Ricci scalar and the Gauss–Bonnet invariant, respectively. We consider the fluid equation of state in the general form, ω = ω(ρ), and we suppose the existence of a bulk viscosity. We investigate quintessence region (ω > −1) and phantom region (ω < −1) and the possibility to change or avoid the singularities in f (R, G)-gravity. Finally, we study the inclusion of quantum effects in large curvature regime.

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