23 papers
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…
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…
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 generali…
The Third Law of Black Hole Dynamics in Lovelock Gravity
Jyotirmoy De, Chiranjeeb Singha, Naresh Dadhich
The third law of black hole dynamics states that it is impossible, through any classical perturbation of a stationary configuration, to reduce the surface gravity of a black hole t…
Bose-Einstein Condensate Dark Matter in the Core of Neutron Stars: Implications for Gravitational-wave Observations
Samanwaya Mukherjee, P. S. Aswathi, Chiranjeeb Singha +1
We investigate neutron stars admixed with dark matter (DM) in the form of a finite-temperature Bos-Einstein condensate (BEC) within a general relativistic two-fluid framework in wh…
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 e…