Accelerating Universe from an Evolving Lambda in Higher Dimension

Details Accelerating Universe from an Evolving Lambda in Higher Dimension Accelerating Universe from an Evolving Lambda in Higher Dimension

2007-09-04

arxiv.org/abs/0709.0374v1

Gen.Rel.Grav.40:833-851,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

18 pages, 9 figures

Scientific paper

10.1007/s10714-007-0534-z

We find exact solutions in five dimensional inhomogeneous matter dominated model with a varying cosmological constant. Adjusting arbitrary constants of integration one can also achieve acceleration in our model. Aside from an initial singularity our spacetime is regular everywhere including the centre of the inhomogeneous distribution. We also study the analogous homogeneous universe in (4+d) dimensions. Here an initially decelerating model is found to give late acceleration in conformity with the current observational demands. We also find that both anisotropy and number of dimensions have a role to play in determining the time of flip, in fact the flip is delayed in multidimensional models. Some astrophysical parameters like the age, luminosity distance etc are also calculated and the influence of extra dimensions is briefly discussed. Interestingly our model yields a larger age of the universe compared to many other quintessential models.

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