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An f(R) Gravitation for Galactic Environments

Published online by Cambridge University Press:  01 August 2006

Y. Sobouti
Y. Sobouti*
Affiliation:
Institute for Advanced Studies in Basic Sciences, Zanjan, P. O. Box 45195-1159, Iransobouti@iasbs.ac.ir
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We propose [Sobouti, arXiv:astro-ph/0603302] an f(R) modification of GR, which admits of a modified Schwarzschild metric. In the weak field limit this amounts to adding a small logarithmic correction to the newtonian potential. A test star moving in such a spacetime acquires a constant speed at large distances. From observations of the velocity curves of spirals, this speed turns out to be proportional to the fourth root of the mass of the central body, in compliance with the Tully-Fisher relation. A variance of MOND emerges as a consequence of the formalism.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 138
Copyright
Copyright © International Astronomical Union 2007