Brane gravityA. Borzou, H. R. Sepangi, S. Shahidi and R. Yousefi
Department of Physics, Shahid Beheshti University - G. C., Evin, Tehran 19839, Iran
received 13 July 2009; accepted in final form 7 October 2009; published October 2009
published online 9 November 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.
98.80.Qc - Quantum cosmology.
04.50.-h - Higher-dimensional gravity and other theories of gravity.
04.50.Kd - Modified theories of gravity.
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