Viscosity in Modified Gravity
Iver BrevikDepartment of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
2012en
ABI
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.
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