Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-02-02
Eur.Phys.J.C70:305-316,2010
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
11 pages, 12 figures
Scientific paper
10.1140/epjc/s10052-010-1457-5
We discuss astrophysical implications of the modified gravity model in which the two matter components, ordinary and dark, couple to separate gravitational fields that mix to each other through small mass terms. There are two spin-2 eigenstates: the massless graviton that induces universal Newtonian attraction, and the massive one that gives rise to the Yukawa-like potential which is repulsive between the ordinary and dark bodies. As a result the distances much smaller than the Yukawa radius $r_m$ the gravitation strength between the two types of matter becomes vanishing. If $r_m \sim 10$ kpc, a typical size of a galaxy, there are interesting implications for the nature of dark matter. In particular, one can avoid the problem of the cusp that is typical for the cold dark matter halos. Interestingly, the flat shape of the rotational curves can be explained even in the case of the collisional and dissipative dark matter (as e.g. mirror matter) that cannot give the extended halos but instead must form galactic discs similarly to the visible matter. The observed rotational curves for the large, medium-size and dwarf galaxies can be nicely reproduced. We also briefly discuss possible implications for the direct search of dark matter.
Berezhiani Zurab
Pilo Luigi
Rossi Nicola
No associations
LandOfFree
Mirror Matter, Mirror Gravity and Galactic Rotational Curves 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 Mirror Matter, Mirror Gravity and Galactic Rotational Curves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mirror Matter, Mirror Gravity and Galactic Rotational Curves will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-158934