Journal Article

Galactic rotation curves and brane-world models

F. Rahaman, M. Kalam, A. DeBenedictis, A. A. Usmani and Saibal Ray

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 389, issue 1, pages 27-33
Published in print September 2008 | ISSN: 0035-8711
Published online August 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13559.x
Galactic rotation curves and brane-world models

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In the present investigation, flat rotational curves of the galaxies are considered under the framework of brane-world models where the four-dimensional effective Einstein equation has extra terms which arise from the embedding of the 3-brane in the five-dimensional 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.

Keywords: gravitation; galaxies: general; galaxies: peculiar; galaxies: structure; dark matter

Journal Article.  4881 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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