12 papers · 1 filter
Emergent Universe and Phantom Tachyon Model
Ujjal Debnath
In this work, I have considered that the universe is filled with normal matter and phantom field (or tachyonic field). If the universe is filled with scalar field, Ellis et al have…
Role of Tachyonic Field in Accelerating Universe in Presence of Perfect Fluid
Writambhara Chakraborty, Ujjal Debnath
Recently tachyonic field has been depicted as dark energy model to represent the present acceleration of the Universe. In this paper we have considered mixture of tachyonic fluid w…
Interaction between scalar field and ideal fluid with inhomogeneous equation of state
Writambhara Chakraborty, Ujjal Debnath
In this letter we study a model of interaction between the scalar field and an inhomogeneous ideal fluid. We have considered two forms of the ideal fluid and a power law expansion…
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…
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…
Generalized Cosmic Chaplygin Gas Model with or without Interaction
Writambhara Chakraborty, Ujjal Debnath, Subenoy Chakraborty
Recently developed Generalized Cosmic Chaplygin gas (GCCG) is studied as an unified model of dark matter and dark energy. To explain the recent accelerating phase, the Universe is…