LRS Bianchi type I models with anisotropic dark energy and constant deceleration parameter |
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Authors: | ?zgür Akarsu and Can Battal K?l?n? |
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Institution: | 1.Faculty of Science, Department of Astronomy and Space Sciences,Ege University,Bornova, Izmir,Turkey |
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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 Einstein’s 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. |
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Keywords: | |
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