Volume 88, Number 2, October 2009
|Number of page(s)||5|
|Section||Geophysics, Astronomy and Astrophysics|
|Published online||09 November 2009|
Department of Physics, Shahid Beheshti University - G. C., Evin, Tehran 19839, Iran
Accepted: 7 October 2009
We consider a brane world scenario in which the bulk action is assumed to have the form of a generic function of the Ricci scalar and derive the resulting Einstein field equations on the brane. In a constant curvature bulk a conserved geometric quantity appears in the field equations which can be associated with matter. We present cosmological and spherically symmetric solutions by assuming specific forms for and show that the former can explain an accelerated expanding universe while the latter may account for galaxy rotation curves.
PACS: 98.80.Qc – Quantum cosmology / 04.50.-h – Higher-dimensional gravity and other theories of gravity / 04.50.Kd – Modified theories of gravity
© EPLA, 2009
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