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16 papers · 2 filters
Charged gravastars admitting conformal motion
A A Usmani, Farook Rahaman, Saibal Ray +4
We propose a new model of a {\it gravastar} admitting conformal motion. While retaining the framework of the Mazur-Mottola model, the gravastar is assumed to be internally charged,…
A comparison of Hořava-Lifshitz gravity and Einstein gravity through thin-shell wormhole construction
Farook Rahaman, P. K. F. Kuhfittig, M. Kalam +2
In this paper we have constructed a new class of thin-shell wormholes from black holes in Hořava-Lifshitz gravity. Particular emphasis is placed on those aspects that allow a compa…
Perfect Fluid Dark Matter
F. Rahaman, K. K. Nandi, A. Bhadra +2
Taking the flat rotation curve as input and treating the matter content in the galactic halo region as perfect fluid, we obtain space time metric at the galactic halo region in the…
The generalized second law of thermodynamics and the nature of the Entropy Function
Subenoy Chakraborty, Nairwita Mazumder, Ritabrata Biswas
In black hole physics, the second law of thermodynamics is generally valid whether the black hole is a static or a non-static one. Considering the universe as a thermodynamical sys…
Five Dimensional Cosmological Models in General Relativity
R. K. Tiwari, Farook Rahaman, Saibal Ray
A Five dimensional Kaluza-Klein space-time is considered in the presence of a perfect fluid source with variable G and . An expanding universe is found by using a relation betwe…
Quintessential Phenomena in Higher Dimensional Space Time
D. Panigrahi, S. Chatterjee
The higher dimensional cosmology provides a natural setting to treat, at a classical level, the cosmological effects of vacuum energy. Here we discuss two situations where starting…