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

Viscosity in Modified Gravity

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)
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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 modified gravity; cosmology; viscous cosmology
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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

AMA Style

Brevik I. Viscosity in Modified Gravity. Entropy. 2012; 14(11):2302-2310.

Chicago/Turabian Style

Brevik, Iver. 2012. "Viscosity in Modified Gravity." Entropy 14, no. 11: 2302-2310.

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