Evolution of the density parameter in the anisotropic DGP cosmology

Details Evolution of the density parameter in the anisotropic DGP cosmology Evolution of the density parameter in the anisotropic DGP cosmology

2011-12-22

arxiv.org/abs/1112.5269v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

To apper in Int.J.Mod.Phys.D, 14 pages, 6 figures

Scientific paper

10.1142/S0218271811020512

Evolution of the density parameter in the anisotropic DGP braneworld model is studied. The role of shear and cross-over scale in the evolution of $\Omega_\rho$ is examined for both the branches of solution in the DGP model. The evolution is modified significantly compared to the FRW model and further it does not depend on the value of $\gamma$ alone. Behaviour of the cosmological density parameter $\Omega_\rho$ is unaltered in the late universe. The study of decceleration parameter shows that the entry of the universe into self accelerating phase is determined by the value of shear. We also obtain an estimate of the shear parameter $\frac{\Sigma}{H_0} \sim 1.68 \times 10^{-10}$, which is in agreement with the constraints obtained in the literature using data.

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