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- Title
New version of viscous Chaplygin gas cosmology with varying gravitational constant.
- Authors
Naji, J.; Heydari, S.; Darabi, R.
- Abstract
In this paper we consider a new version of Chaplygin gas cosmology that includes bulk viscosity and a varying gravitational constant. This new model of Chaplygin gas allows us to recover a barotropic fluid with a quadratic equation of state. Bulk viscosity is assumed to be a power law function of the energy density. We study the evolution of dark energy density numerically for several forms of scale factor and analytically under some assumptions corresponding to a late epoch of the universe. We discuss some cosmological parameters and fix them using recent observational data, such as those from the Background Imaging of Cosmic Extragalactic Polarization 2 (BICEP2) telescope.
- Subjects
METAPHYSICAL cosmology; GRAVITATIONAL constant; BULK viscosity; DARK energy; BACKGROUND Imaging of Cosmic Extragalactic Polarization; QUADRATIC equations
- Publication
Canadian Journal of Physics, 2014, Vol 92, Issue 12, p1556
- ISSN
0008-4204
- Publication type
Article
- DOI
10.1139/cjp-2014-0226