Regular Article - Theoretical Physics
Viscous dark cosmology with account of quantum effects
Department of Energy and Process Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway
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Published online: 1 August 2008
The analytic properties of the energy density ρ(t) of the cosmic fluid and the Hubble parameter H(t) are investigated close to the future singularity t=t s assuming different forms for the equation of state. First, it is shown that the inclusion of quantum effects coming from the conformal anomaly modifies the singularity. Thereafter, we consider the effect coming from the bulk viscosity in the fluid. The viscosity tends to reduce the magnitude of t s, but does not alter the singularity itself (the exponent). The main emphasis is laid on the simple case when the equation of state is p=w ρ, with w a constant.
© Springer-Verlag , 2008