246 citations · 1.6k across the 57 of their papers we have counts for
4 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,…
Brans-Dicke Wormhole Revisited -- II
Ramil Izmailov, Amrita Bhattacharya, Kamal K. Nandi
In a recent paper [arXiv:0910.1109], a wormhole range in the Jordan frame, -3/2<ω<-4/3 for the vacuum Brans-Dicke Class I solution was derived. On general grounds and under certain…
Upper Limit on the Size of Galactic Halo via Hamiltonian Approach
Amrita Bhattacharya, Ruslan Isaev, K. B. Vijayakumar +1
Using the approach of autonomous Hamiltonian dynamical system, we attempt to estimate the as yet unknown upper limit on the size of the galactic halo surrounding galaxies (lenses).…
The Vacuole Model: New Terms in the Second Order Deflection of Light
Amrita Bhattacharya, Guzel M. Garipova, Ettore Laserra +2
The present paper is an extension of a recent work (Bhattacharya et al. 2010) to the Einstein-Strauss vacuole model with a cosmological constant, where we work out the light deflec…