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41 papers · 1 filter
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…
GMRT observation towards detecting the Post-reionization 21-cm signal
Abhik Ghosh, Somnath Bharadwaj, Sk. Saiyad Ali +1
We have analyzed 610 MHz GMRT observations towards detecting the redshifted 21-cm signal from z=1.32. The multi-frequency angular power spectrum C_l(Delta nu) is used to characteri…
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…