Browsing by Author "Rehman, Muhammad Aziz ur"

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    Fate of Electromagnetic Field on the Cracking of PSR J1614-2230 in Quadratic Regime.
    (Advances in High Energy Physics, 2015-09-07) Mardan, Syed Ali; Rehman, Muhammad Aziz ur
    This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3 . We study the cracking of compact object PSR J1614-2230 in quadratic regime with electromagnetic field. For this purpose, we develop a general formalism to determine the cracking of charged compact objects. We apply local density perturbations to hydrostatic equilibrium equation as well as physical variables involved in the model. We plot the force distribution function against radius of the star with different parametric values of model both with and without charge. It is found that PSR J1614-2230 remains stable (no cracking) corresponding to different values of parameters when charge is zero, while it exhibits cracking (unstable) when charge is introduced. We conclude that stability region increases as amount of charge increases.
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    Study of polytropes with Generalized polytropic Equation of State
    (European Physics Journal , Springer link, 2016-06-08) Noureen, Ifra; Rehman, Muhammad Aziz ur
    The aim of this paper is to discuss the theory of Newtonian and relativistic polytropes with a generalized polytropic equation of state. For this purpose, we formulated the general framework to discuss the physical properties of polytropes with an anisotropic inner fluid distribution under conformally flat condition in the presence of charge. We investigate the stability of these polytropes in the vicinity of a generalized polytropic equation through the Tolman mass. It is concluded that one of the derived models is physically acceptable.