2019

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Browsing 2019 by Author "Ahsan Ali Siddiqui"

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    New classes of charged anisotropic dissipative polytropes
    (UMT Lahore, 2019-07-26) Ahsan Ali Siddiqui
    In this thesis, new classes of polytropic models has been developed by using polytropic equation of state (PEoS) in the vicinity of spherical symmetry with isotropic coordinates. The inner fluid configuration is charged anisotropic and models are developed for different values of polytropic index.Mass and radii of twelve stars 4U 1608-52, 4U 1820-30, PSR J1614-2230, PSR J1903-0327, Vela X-1, Cen X-3, EXO 1785-248, SMC X-4, LMC X-4, SAX J1808.4-3658, 4U 1538-52 and Her X-1 have been regained with the help of developed models. The stability of models is discussed by using speed of sound technique and graphical analysis of model parameters. It is concluded that all models are well behaved and physically acceptable.