Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2012-04-14
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
12 pages, 1 figure
Scientific paper
We investigate the possibility that the galactic dark matter exists in the phantom field responsible for the dark energy. We obtain the statically and spherically exact solution for this kind of the galaxy system with a supermassive black hole at its center. The solution of the metric functions is satisfied with $g_{tt} = - g_{rr}^{-1}$. Constrained by the observation of the rotational stars moving in circular orbits with nearly constant tangential speed in a spiral galaxy, the background of the phantom field which is spatially inhomogeneous has an exponential potential. The absorption cross section of the low-energy $S$-wave excitations, arising from the phantom dark energy, into the central black hole is shown to be the horizontal area of the central black hole. Because the infalling phantom particles have a total negative energy, the accretion of the phantom energy is companied with the decrease of the black hole mass which is estimated to be much less than a solar mass in the lifetime of the Universe. Using a simple model with the cold dark matters very weakly coupled to the phantom particles which are generated from the background, we show that these two densities can be stable in the galaxy.
Li Ming-Hsun
Yang Kwei-Chou
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