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Galaxies 2013, 1(2), 83-95; doi:10.3390/galaxies1020083

Inhomogeneous Viscous Fluids in a Friedmann-Robertson-Walker (FRW) Universe

1 Eurasian International Center for Theoretical Physics and Department of General Theoretical Physics, Eurasian National University, Astana 010008, Kazakhstan 2 Department of Physics, University of Trento, Italy and Gruppo Collegato di Trento, Istituto Nazionaledi Fisica Nucleare, Sezione di Padova, Trento 38123, Italy
* Author to whom correspondence should be addressed.
Received: 20 May 2013 / Revised: 26 June 2013 / Accepted: 27 June 2013 / Published: 9 July 2013
(This article belongs to the Special Issue Cosmology with Fluid Components)
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We give a brief review of some aspects of inhomogeneous viscous fluids in a flat Friedmann-Robertson-Walker Universe. In general, it is pointed out that several fluid models may bring the future Universe evolution to become singular, with the appearance of the so-called Big Rip scenario. We investigate the effects of fluids coupled with dark matter in a de Sitter Universe, by considering several cases. Due to this coupling, the coincidence problem may be solved, and if the de Sitter solution is stable, the model is also protected against the Big Rip singularity.
Keywords: inhomogeneous fluids; viscous fluids; dark matter inhomogeneous fluids; viscous fluids; dark matter
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Myrzakulov, R.; Sebastiani, L.; Zerbini, S. Inhomogeneous Viscous Fluids in a Friedmann-Robertson-Walker (FRW) Universe. Galaxies 2013, 1, 83-95.

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