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arxiv: 1507.03515 · v2 · pith:I3LIWE7Dnew · submitted 2015-05-29 · ⚛️ physics.gen-ph

Anisotropic dark energy model with a hybrid scale factor

classification ⚛️ physics.gen-ph
keywords alongcosmiclatemodelpressureanisotropictimeanisotropies
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Anisotropic dark energy model with dynamic pressure anisotropies along different spatial directions is constructed at the backdrop of a spatially homogeneous diagonal Bianchi type $V$ $(BV)$ space-time in the framework of General Relativity. A time varying deceleration parameter generating a hybrid scale factor is considered to simulate a cosmic transition from early deceleration to late time acceleration. We found that the pressure anisotropies along the $y-$ and $z-$ axes evolve dynamically and continue along with the cosmic expansion without being subsided even at late times. The anisotropic pressure along the $x-$axis becomes equal to the mean fluid pressure. At a late phase of cosmic evolution, the model enters into a phantom region. From a state finder diagnosis, it is found that the model overlaps with $\Lambda$CDM at late phase of cosmic time.

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