2008/06/09 by I. Brevik, O. Gorbunova · 2 citations
Physics and Astronomy · #Anomaly (physics) #Black Holes and Theoretical Physics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Hubble's law #Quantum #Singularity #Viscosity #Volume viscosity #gr-qc
paper · pdf · doi:10.1140/epjc/s10052-008-0664-9
published as Eur.Phys.J.C56:425-428,2008 · 10 pages, no figures; to appear in Eur. Phys. J. C
arxiv created 2008/06/09 · openalex publication_date 2008/07/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The analytic properties of the energy density rho(t) of the cosmic fluid, and the Hubble parameter H(t), are investigated near to the future singularity t=ts 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 a bulk viscosity in the fluid. The viscosity tends to reduce the magnitude of ts, but does not alter the singularity itself (the exponent). Main emphasis is laid on the simple case when the equation of state is p=w*rho, with w a constant.