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- Title
LRS Bianchi type I models with anisotropic dark energy and constant deceleration parameter.
- Authors
Ãzgür Akarsu; Can Kılınç
- Abstract
Abstract  Locally rotationally symmetric Bianchi type I cosmological models are examined in the presence of dynamically anisotropic dark energy and perfect fluid. We assume that the dark energy (DE) is minimally interacting, has dynamical energy density, anisotropic equation of state parameter (EoS). The conservation of the energy-momentum tensor of the DE is assumed to consist of two separately additive conserved parts. A special law is assumed for the deviation from isotropic EoS, which is consistent with the assumption on the conservation of the energy-momentum tensor of the DE. Exact solutions of Einsteinâs field equations are obtained by assuming a special law of variation for the mean Hubble parameter, which yields a constant value of the deceleration parameter. Geometrical and kinematic properties of the models and the behaviour of the anisotropy of the dark energy have been carried out. The models give dynamically anisotropic expansion history for the universe that allows to fine tune the isotropization of the Bianchi metric, hence the CMB anisotropy.
- Subjects
SYMMETRY (Physics); ANISOTROPY; DARK energy; ACCELERATION (Mechanics); METAPHYSICAL cosmology; EQUATIONS of state; FIELD theory (Physics)
- Publication
General Relativity & Gravitation, 2010, Vol 42, Issue 1, p119
- ISSN
0001-7701
- Publication type
Article
- DOI
10.1007/s10714-009-0821-y