Possible features of galactic halo with electric field and observational constraints

TL;DR

This paper explores a model of the galactic halo incorporating electric fields from charged particles, analyzing dark matter properties and comparing theoretical predictions with observational data.

Contribution

It introduces a novel model of the galactic halo that includes electric fields due to charged particles, providing new insights into dark matter characteristics.

Findings

Electric field presence influences dark matter distribution.

Derived equations of state for dark matter in the halo.

Comparison with observational data constrains model parameters.

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.