Testing an exact $f(R)$-gravity model at Galactic and local scales

Details Testing an exact $f(R)$-gravity model at Galactic and local scales Testing an exact $f(R)$-gravity model at Galactic and local scales

2009-06-30

arxiv.org/abs/0906.5430v2

Astron.Astrophys.505:21-28,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, 2 figures, accepted in Astron. & Astroph

Scientific paper

10.1051/0004-6361/200911992

The weak field limit for a pointlike source of a $f(R) \propto R^{3/2}$-gravity model is studied. We aim to show the viability of such a model as a valid alternative to GR + dark matter at Galactic and local scales. Without considering dark matter, within the weak field approximation, we find general exact solutions for gravity with standard matter, and apply them to some astrophysical scales, recovering the consistency of the same $f(R)$-gravity model with cosmological results.}{In particular, we show that it is possible to obtain flat rotation curves for galaxies, [and consistency with] Solar System tests, as in the so-called "Chameleon Approach". In fact, the peripheral velocity $ v_\infty $ is shown to be expressed as $ v_\infty = \lambda \sqrt{M}$, so that the Tully-Fisher relation is recovered. The results point out the possibility of achieving alternative theories of gravity in which exotic ingredients like dark matter and dark energy are not necessary, while their coarse-grained astrophysical and cosmological effects can be related to a geometric origin.

Affiliated with

Also associated with

No associations

Rating

Testing an exact $f(R)$-gravity model at Galactic and local scales does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Testing an exact $f(R)$-gravity model at Galactic and local scales, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Testing an exact $f(R)$-gravity model at Galactic and local scales will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-440356