2014/09/29 by Koushik Chakraborty, Farook Rahaman, Saibal Ray +2 · 17 citations
Physics and Astronomy · #Astronomy #Astrophysics #Baryonic dark matter #Cosmology #Cosmology and Gravitation Theories #Cuspy halo problem #Dark energy #Dark fluid #Dark matter #Dark matter halo #Galactic corona #Galactic halo #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy rotation curve #Halo #Hot dark matter #Physics #Scalar field dark matter #Solar and Space Plasma Dynamics #physics.gen-ph
paper · pdf · doi:10.1007/s10714-014-1807-y
published in General Relativity and Gravitation 46(10) (Springer Science+Business Media) · 13 pages, 18 figures
openalex publication_date 2014/09/29 · arxiv created 2014/12/15 · arxiv updated 2014/12/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Observed rotational curves of neutral hydrogen clouds strongly support the fact that galactic halo contains huge amount of nonluminous matter, the so called gravitational dark matter. The nature of dark matter is a point of debate among the researchers. Recent observations reported the presence of ions of O, S, C, Si etc in the galactic halo and intergalactic medium. This supports the possibility of existence of electric field in the galactic halo region. We therefore propose a model of galactic halo considering this electric field arising due to charged particles as one of the inputs for the background spacetime metric. Considering dark matter as an anisotropic fluid we obtain the expressions for energy density and pressure of dark matter there and consequently the equation of state of dark matter. Various other aspects of the solutions are also analyzed along with a critical comparison with and constraints of different observational evidences.