753 citations · 757 across the 12 of their papers we have counts for
5 papers · 1 filter
Non-minimal coupling of scalar fields in the dark sector and generalization of the top-hat collapse
Priyanka Saha, Dipanjan Dey, Kaushik Bhattacharya
In this article, we propose a new way to handle interactions between two scalar fields in the cosmological backdrop where one scalar field oscillates rapidly in the cosmological ti…
End equilibrium state of a spherical gravitational collapse in the presence of matter and scalar field
Debanjan Debnath, Dipanjan Dey, Kaushik Bhattacharya
We explore the possibilities of modeling a spherically symmetric static spacetime that can emerge as the end state of gravitational collapse, by considering it to be seeded by a co…
Redundancy of the cosmological evolution equations and its relationship with the initial conditions
Kaushik Bhattacharya, Dipanjan Dey, Priyanka Saha
It is known that in Friedmann-Lemaitre-Robertson-Walker cosmology one has more number of dynamical equations, compared to the number of unknown variables. This fact makes some equa…
Gravitational collapse of matter in the presence of non-minimally coupled Quintessence and Phantom-like scalar fields
Priyanka Saha, Dipanjan Dey, Kaushik Bhattacharya
This paper explores the evolution of the over-dense region of dark matter in the presence of a non-minimally coupled scalar field which is used to model quintessence and phantom-li…
The Definition of a Photon Surface in an Invariant Spin Frame
Dipanjan Dey, Alan A. Coley, Nicholas T. Layden
This paper defines the photon surface conditions using Cartan scalars within an invariant spin frame, offering a comprehensive description of the local spacetime geometry. By emplo…