Viscosity in Modified Gravity

Entropy

关键词: modified gravity;    cosmology;    viscous cosmology;   

DOI  :  10.3390/e14112302

来源: mdpi

【 摘 要 】

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

【 授权许可】

CC BY   
© 2012 by the author; licensee MDPI, Basel, Switzerland.