| Issue |
A&A
Volume 464, Number 3, March IV 2007
|
|
|---|---|---|
| Page(s) | 921 - 925 | |
| Section | Galactic structure, stellar clusters, and populations | |
| DOI | https://doi.org/10.1051/0004-6361:20065188 | |
| Published online | 22 January 2007 | |
An 
gravitation for galactic environments
Institute for Advanced Studies in Basic Sciences, PO B 45195-1159, Zanjan, Iran e-mail: sobouti@iasbs.ac.ir
Received:
13
March
2006
Accepted:
13
December
2006
We propose an action-based 
modification of Einstein's
gravity that admits a modified Schwarzschild-deSitter 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 asymptotic speed at large
distances. This speed, calibrated empirically, is proportional to
the fourth root of the mass of the central body in compliance with
the Tully-Fisher relation. A variance of MOND's gravity emerges as
an inevitable consequence of the proposed formalism. It has also
been shown (Mendoza et al. [CITE], [arXiv:astroph/0610390]) that a) the gravitational waves
in this spacetime propagate with the speed of light in vacuum and
b) there is a lensing effect added to what one finds in the
classic GR.
Key words: cosmology: theory / cosmology: dark matter / gravitation / galaxies: photometry
© ESO, 2007
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