Galactic rotation curves and brane-world models

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...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2008-09, Vol.389 (1), p.27-33
Main Authors: Rahaman, F., Kalam, M., DeBenedictis, A., Usmani, A. A., Ray, Saibal
Format: Article
Language:English
Subjects:
Astronomy
Dark matter
Earth, ocean, space
Exact sciences and technology
galaxies: general
galaxies: peculiar
galaxies: structure
gravitation
Gravity
Stars & galaxies
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Summary: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.
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2008.13559.x