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Entropy 2012, 14(11), 2302-2310; doi:10.3390/e14112302

Article

Viscosity in Modified Gravity

Iver Brevik

Department of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway

Received: 19 October 2012; in revised form: 6 November 2012 / Accepted: 8 November 2012 / Published: 12 November 2012

(This article belongs to the Special Issue Modified Gravity: From Black Holes Entropy to Current Cosmology)

Download PDF Full-Text [193 KB, uploaded 12 November 2012 10:23 CET]

Abstract: A bulk viscosity is introduced in the formalism of modified gravity. It is shownthat, based on a natural scaling law for the viscosity, a simple solution can be found forquantities such as the Hubble parameter and the energy density. These solutions mayincorporate a viscosity-induced Big Rip singularity. By introducing a phase transition inthe cosmic fluid, the future singularity can nevertheless in principle be avoided.

Keywords: modified gravity; cosmology; viscous cosmology

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