Viscous Little Rip Cosmology
Jul, 2011
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Abstract: (arXiv)
Dark energy of phantom or quintessence nature with an equation of state parameter 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 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.Note:
- 10 pages, version to appear in PRD
- 95.35.+d
- 04.20.Jb
- 04.62.+v
- effect: viscosity
- dark energy: phantom
- big rip
- cosmological model
- dark energy: equation of state
- quintessence
- singularity
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