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    Relativistic anisotropic charged fluid spheres with varying cosmological constant
    (2011-07-05) Ray, Saibal; Bhadra, Sumana; Sengupta, Anand
    Static spherically symmetric anisotropic source has been studied for the Einstein- Maxwell field equations assuming the erstwhile cosmological constant Λ to be a space-variable scalar, viz., Λ = Λ(r). Two cases are examined out of which one reduces to isotropic sphere. The solutions thus obtained are shown to be electromagnetic in origin as a particular case. It is also shown that the generally used pure charge condition, viz., ρ+pr = 0 is not always required for constructing electromagnetic mass models.