English

Anisotropic dark energy model with a hybrid scale factor

General Physics 2017-05-10 v2

Abstract

Anisotropic dark energy model with dynamic pressure anisotropies along different spatial directions is constructed at the backdrop of a spatially homogeneous diagonal Bianchi type VV (BV)(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 yy- and zz- axes evolve dynamically and continue along with the cosmic expansion without being subsided even at late times. The anisotropic pressure along the xx-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 Λ\LambdaCDM at late phase of cosmic time.

Keywords

Cite

@article{arxiv.1507.03515,
  title  = {Anisotropic dark energy model with a hybrid scale factor},
  author = {B. Mishra and S. K. Tripathy},
  journal= {arXiv preprint arXiv:1507.03515},
  year   = {2017}
}
R2 v1 2026-06-22T10:10:53.553Z