Viscous Little Rip Cosmology

By Iver Brevik, E. Elizalde, Shin'ichi Nojiri, Sergei D. Odintsov. 2011

214 citations recorded by the source corpus.

Dark energy of phantom or quintessence nature with an equation of state parameter $w$ almost equal to -1 often leads the universe evolution to a finite-time future singularity. An elegant solution to this problem has been recently proposed \cite{frampton11} under the form of the so-called Little Rip cosmology which appears to be a realistic alternative to the $\Lambda$CDM model. A viscous Little Rip cosmology is here proposed. Whereas generically bulk viscosity tends to promote the Big Rip, we find that there are a number of situations where this is not the case and where the formalism nicely adjusts itself to the Little Rip scenario. We prove, in particular, that a viscous fluid (or, equivalently, one with an inhomogeneous (imperfect) equation of state) is perfectly able to produce a Little Rip cosmology as a purely viscosity effect. The possibility of its induction as a combined result of viscosity and a general (power-like) equation of state is also investigated in detail. To finish, a physical, inertial force interpretation of the dissolution of bound structures in the Little Rip cosmology is presented.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/2b797ae940c26409c491d9ac79e179b3c64604ce

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Citations in the corpus

Viscous Cosmology for Early- and Late-Time Universe (2017, background): “Amongst them, the Little Rip scenario proposed by Frampton et al. [132, 133] (for nonviscous fluids) is an elegant solution, which we will consider in more detail in this subsection, generalized to the case of viscous fluids.”