Viscous Fluids and Gauss-Bonnet Modified Gravity

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, $\omega =\omega (\rho )$, and we suppose the existence of a bulk viscosity. We investigate quintessence region ($\omega >-1$) and phantom region ($\omega <-1$) and the possibility to change or avoid the singularities in $f(R,G)$-gravity. Finally, we study the inclusion of quantum effects in large curvatures regime.

14 pages

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Cited by in corpus (12)

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• Some aspects of generalized modified gravity models
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• Gauss-Bonnet lagrangian G ln G and cosmological exact solutions
• Gravitoelectromagnetism and other decompositions of the Riemann tensor
• Crossing the phantom divide with dissipative normal matter in the Israel-Stewart-Hiscock formalism
• Viscous Generalized Chaplygin Gas Interacting with f(R,T) gravity
• Viscous Dark Energy in $f(T)$ Gravity
• Inhomogeneous viscous fluids for inflation
• Inhomogeneous viscous fluids in FRW universe
• No stable dissipative phantom scenario in the framework of a complete cosmological dynamics
• Quintessence dark energy model in non-linear $f(Q)$ theory with bulk-viscosity