F C Ragel
Articles written in Pramana – Journal of Physics
Volume 78 Issue 5 May 2012 pp 687-696 Research Articles
We study static spherically symmetric spacetime to describe compact objects with anisotropic matter distribution. We express the system of Einstein ﬁeld equations as a new system of differential equations using a coordinate transformation, and then write the system in another form with polytropic equation of state and obtain two classes of exact models. The models satisfy all major physical features expected in a realistic star. For polytropic index $n = 2$, we obtain expressions for mass and density which are comparable with the reported experimental observations.
Volume 81 Issue 2 August 2013 pp 275-286 Research Articles
Static spherically symmetric space-time is studied to describe dense compact star with quark matter within the framework of
Volume 83 Issue 1 July 2014 pp 83-93
We study static spherically symmetric space-time to describe relativistic compact objects with anisotropic matter distribution and derive two classes of exact models to the Einstein–Maxwell system with a modified Van derWaals equation of state. We motivate a Van derWaals-type equation of state to physically signify a high-density domain of quark matter, and the generated exact solutions are shown to contain several classes of exact models reported previously that correspond to various physical scenarios. Geometrical analysis shows that the physical quantities are well behaved so that these models may be used to describe anisotropic charged compact spheres.
Volume 93 | Issue 5
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