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

Viscosity in Modified Gravity

Department of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
Received: 19 October 2012 / Revised: 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)
View Full-Text   |   Download PDF [193 KB, uploaded 24 February 2015]


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. View Full-Text
Keywords: modified gravity; cosmology; viscous cosmology modified gravity; cosmology; viscous cosmology
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Brevik, I. Viscosity in Modified Gravity. Entropy 2012, 14, 2302-2310.

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