Galactic rotation curves and brane world models

Details Galactic rotation curves and brane world models Galactic rotation curves and brane world models

2008-02-24

arxiv.org/abs/0802.3453v2

Mon.Not.Roy.Astron.Soc.389:27,2008

Astronomy and Astrophysics

Astrophysics

7 Latex pages, 7 figures; Edited substantially with new figures and references; Accepted for Mon. Not. R. Astron. Soc

Scientific paper

10.1111/j.1365-2966.2008.13559.x

In the present investigation flat rotational curves of the galaxies are considered under the framework of brane-world models where the 4d effective Einstein equation has extra terms which arise from the embedding of the 3-brane in the $5d$ bulk. It has been shown here that these long range bulk gravitational degrees of freedom can act as a mechanism to yield the observed galactic rotation curves without the need for dark matter. The present model has the advantage that the observed rotation curves result solely from well-established non-local effects of gravitation, such as dark radiation and dark pressure under a direct use of the condition of flat rotation curves and does not invoke any exotic matter field.

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