Browsing by Author "H. Rizwana Kausar"

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    Dissipative spherical collapse of charged anisotropic fluid in f (r) gravity
    (The European Physical Journal C, 2014) H. Rizwana Kausar; Ifra Noureen
    This manuscript is devoted to study the combined effect of a viable f(R) = R + Rn model and electromagnetic field on the instability range of gravitational collapse. We assume charged anisotropic fluid that dissipate energy via heat flow and discuss that electromagnetic field, density inhomogeneity, shear and phase transition on astrophysi- cal bodies can be incorporated by locally anisotropic background. Dy- namical equations help to investigate the evolution of self-gravitating objects and leads to the conclusion that adiabatic index depend upon the electromagnetic background, mass and radius of the spherical ob- jects.
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    Dynamical analysis of charged anisotropic spherical star in f(r) gravity
    (The European Physical Journal Plus, 2015) H. Rizwana Kausar; Ifra Noureen; M. Umair Shahzad
    We consider a modified gravity theory, f(R) = R + Rn − μ4 Rm , in the metric formulation and analyze the contribution of electromag- netic field on the range of dynamical instability of a star filled with anisotropic matter. The collapse equation is developed by applying conservation on anisotropic matter, Maxwell source and dark source terms arising due to f(R) gravity. Specific perturbation scheme is implemented and it is observed that the inclusion of Maxwell source slows down the collapse and makes system more stable in Newtonian regime. Also, we make comparison of our results with the existing literature.