120 citations · 318 across the 43 of their papers we have counts for
47 papers
Bouncing Dust Collapse and Black-to-White Hole Transition on the Brane
Rikpratik Sengupta, Chiranjeeb Singha
We study the spherical collapse of a homogeneous dust cloud on a three-brane in the Shtanov--Sahni braneworld, in which the extra dimension is timelike. In the high-energy regime t…
From Density to Mass: A New Parametrized Framework for Dark Matter Environment Around Black Holes
Rajes Ghosh, Nicholas Speeney, Avijit Chowdhury +3
Astrophysical black holes (BHs) are not isolated vacuum objects but are expected to reside within complex environments, such as dark matter (DM) halos and baryonic distributions. S…
On The Regularized McVittie Black Bounce and a Family of Traversable Wormholes
Soumya Chakrabarti, Chiranjeeb Singha
The McVittie metric describes a self-gravitating compact object embedded in an expanding universe. It inherits two singularities: a curvature singularity at and a cosmolo…
Tidal deformation of an accreting compact object
Avijit Chowdhury, Chiranjeeb Singha, Kazuharu Bamba +1
Tidal deformation of a compact object serves as a sensitive probe of the strong-gravity regime and nature of the compact object. It captures how a compact object responds to the ex…
Oppenheimer-Snyder Collapse in f(R) Gravity : Stalemate or Resolution?
Soumya Chakrabarti, Apratim Ganguly, Radouane Gannouji +1
We study the Oppenheimer--Snyder (OS) collapse problem in metric gravity by matching a homogeneous dust Friedmann--Lemaître--Robertson--Walker (FLRW) interior to a generaliz…
Boltzmann Dynamics in K-essence Cosmology: Photon Propagation in an Emergent Spacetime
Krishnendu Roy, Debashis Gangopadhyay, Chiranjeeb Singha +1
Recent cosmological tensions, notably the Hubble and tensions, motivate extensions of the conventional FLRW framework in which additional dynamical fields can alter the eff…