Abstract
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.




















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Acknowledgments
KC, FR and SR are thankful to the authority of Inter-University Centre for Astronomy and Astrophysics, Pune, India for providing them Visiting Associateship under which a part of this work was carried out. FR is also thankful to UGC, for providing financial support under research award scheme. KC is thankful to UGC for providing financial support in MRP under which this research work was carried out. We all are grateful to the anonymous referees for their constructive suggestions which have enabled us to upgrade the manuscript substantially.
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Chakraborty, K., Rahaman, F., Ray, S. et al. Possible features of galactic halo with electric field and observational constraints. Gen Relativ Gravit 46, 1807 (2014). https://doi.org/10.1007/s10714-014-1807-y
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DOI: https://doi.org/10.1007/s10714-014-1807-y