On the Dark Matter Halo of the Milky Way: Anisotropic Pressure

The current study delves into a novel class of static, spherically symmetric anisotropic fluid solutions to the Einstein field equations, aimed at elucidating the nature of the dark matter halo. To construct the model, we have used the phenomenological flat rotational curve condition and a specific expression for the radial pressure. The analytic solution produces well-behaved metric potentials and accurately reproduces the true mass of the Milky Way (MW) galaxy. Our findings indicate that the gravitational influence in the halo is inherently attractive. The circular orbits in the halo in which the particles are moving are stable. The halo is Newtonian in nature and filled with non-exotic dust fluid.