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17 papers · 2 filters
Shell Crossing Singularities in Quasi-Spherical Szekeres Models
Subenoy Chakraborty, Ujjal Debnath
We investigate the occurrence of shell crossing singularities in quasi-spherical Szekeres dust models with or without a cosmological constant. We study the conditions for shell cro…
Emergent Universe in Brane World Scenario with Schwarzschild-de Sitter Bulk
Asit Banerjee, Tanwi Bandyopadhyay, Subenoy Chakraborty
A model of an emergent universe is obtained in brane world. Here the bulk energy is in the form of cosmological constant, while the brane consists of a fluid satisfying an equation…
Junction Conditions and Consequences of Quasi-Spherical Space-Time with Electro-Magnetic Field and Vaidya Matric
Soma Nath, Ujjal Debnath, Subenoy Chakraborty
In this work the junction conditions between the exterior Reissner-Nordstrom-Vaidya space-time with the interior quasi-spherical Szekeres space-time have been studied for analyzing…
Logarithm of the scale factor as a generalised coordinate in a lagrangian for dark matter and dark energy
Debashis Gangopadhyay, Somnath Mukherjee
A lagrangian for the essence field is set up with canonical kinetic terms and incorporating the scaling relation of [1]. There are two degrees of freedom, {\it viz.},$q(t)= ln…
Gravitational Collapse in Higher Dimensional Husain Space-Time
Ujjal Debnath, Narayan Chandra Chakraborty, Subenoy Chakraborty
We investigate exact solution in higher dimensional Husain model for a null fluid source with pressure and density are related by the following relations (i) , (ii) $…
Some new class of Chaplygin Wormholes
F. Rahaman, M. Kalam, K. A. Rahman
Some new class of Chaplygin wormholes are investigated in the framework of a Chaplygin gas with equation of state , . Since empty spacetime () do…