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- Jadavpur UniversityIN38 papers
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8 papers · 2 filters
Acceleration of the Universe in Presence of Tachyonic field
Surajit Chattopadhyay, Ujjal Debnath, Goutami Chattopadhyay
In this letter, we have assumed that the Universe is filled in tachyonic field with potential, which gives the acceleration of the Universe. For certain choice of potential, we hav…
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…
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…
Variable Modified Chaplygin Gas and Accelerating Universe
Ujjal Debnath
In this letter, I have proposed a model of variable modified Chaplygin gas and shown its role in accelerating phase of the universe. I have shown that the equation of state of this…
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) $…
Is the shell-focusing singularity of Szekeres space-time visible?
Brien C. Nolan, Ujjal Debnath
The visibility of the shell-focusing singularity in Szekeres space-time - which represents quasi-spherical dust collapse - has been studied on numerous occasions in the context of…