16 citations · 62 across the 28 of their papers we have counts for
7 papers · 1 filter
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, necessitate extensions of the conventional CDM framework, wherein additional dynamical fields alter the ef…
Chaotic Dynamics in Extremal Black Holes: A Challenge to the Chaos Bound
Surojit Dalui, Chiranjeeb Singha, Krishnakanta Bhattacharya
We investigate chaotic dynamics in extremal black holes by analyzing the motion of massless particles in both Reissner-Nordström and Kerr geometries. Two complementary approaches (…
Geometric properties of slowly rotating black holes embedded in matter environments
Sayak Datta, Chiranjeeb Singha
Extreme mass-ratio inspirals (EMRIs) provide a precise probe of strong-field gravity, where small deviations from vacuum Kerr geometry can accumulate over many orbital cycles. In r…