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Galactic rotation curves and brane-world models |
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| Authors: | F Rahaman M Kalam A DeBenedictis A A Usmani Saibal Ray |
| Institution: | Department of Mathematics, Jadavpur University, Kolkata 700 032, West Bengal, India;Department of Physics, Netaji Nagar College for Women, Regent Estate, Kolkata 700 092, West Bengal, India;Pacific Institute for Mathematical Sciences, Simon Fraser University Site and Department of Physics, Simon Fraser University, Burnaby, BC V5A 1S6, Canada;Department of Physics, Aligarh Muslim University, Aligarh 202 002, Uttar Pradesh, India;Department of Physics, Barasat Government College, North 24 Parganas, Kolkata 700 124, West Bengal, India |
| Abstract: | 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 |