Late-time acceleration in Higher Dimensional Cosmology

Details Late-time acceleration in Higher Dimensional Cosmology Late-time acceleration in Higher Dimensional Cosmology

2011-04-11

arxiv.org/abs/1104.1925v2

JCAP 1109 (2011) 015

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, 5 figures

Scientific paper

10.1088/1475-7516/2011/09/015

We investigate late time acceleration of the universe in higher dimensional cosmology. The content in the universe is assumed to exert pressure which is different in the normal and extra dimensions. Cosmologically viable solutions are found to exist for simple forms of the equation of state. The parameters of the model are fixed by comparing the predictions with supernovae data. While observations stipulate that the matter exerts almost vanishing pressure in the normal dimensions, we assume that, in the extra dimensions, the equation of state is of the form $P \propto \, \rho^{1 - \gamma}$. For appropriate choice of parameters, a late time acceleration in the universe occurs with $q_0$ and $z_{tr}$ being approximately -0.46 and 0.76 respectively.

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