Abstract
Interior solutions of Einstein field equations for anisotropic spheres with variable energy density are obtained. The solutions for uniform energy density [10] and for radial pressure equal to zero [11] are particular cases of the present solution. With this solution we are also able to discuss an anisotropic gas sphere. Physically it explains larger red-shifts of different quasi-stellar objects. The results of the model have been used to explain the behaviour of a neutron stars and conclude that the maximum mass of a neutron star does not exceed two solar masses, which confirms the Chandrasekhar limit.
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Gokhroo, M.K., Mehra, A.L. Anisotropic spheres with variable energy density in general relativity. Gen Relat Gravit 26, 75–84 (1994). https://doi.org/10.1007/BF02088210
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DOI: https://doi.org/10.1007/BF02088210