7 papers
The Ringdown and the Tide: Fingerprints of Dark Matter Halo Profiles
Arkadip Bhowmik, Avijit Chowdhury, Sayan Chakrabarti
Astrophysical black holes (BH) are not isolated, but embedded in matter supplied by their host galaxies. We study how the shape of a surrounding dark matter (DM) halo modifies the…
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…
Dark matter halos and transonic accretion flow
Avijit Chowdhury, Gargi Sen, Sayan Chakrabarti +1
The interplay between supermassive black holes (SMBHs) and their surrounding environment is fundamental to understanding galactic evolution. This work investigates the influence of…
Birkhoff's Theorem and Uniqueness: A Peek Beyond General Relativity
Rajes Ghosh, Akash K Mishra, Avijit Chowdhury
In General Relativity, Birkhoff's theorem asserts that any spherically symmetric vacuum solution must be static and asymptotically flat. In this paper, we study the validity of Bir…
Effect of generic dark matter halo on transonic accretion onto galactic black holes
Avijit Chowdhury, Gargi Sen, Sayan Chakrabarti +1
The environment surrounding a black hole or black hole binaries is generally expected to play an important role in understanding various astrophysical phenomena around them. In thi…
Connecting quasi-normal modes with causality in Lovelock theories of gravity
Avijit Chowdhury, Akash K Mishra, Sumanta Chakraborty
The eikonal correspondence between the quasi-normal modes (QNMs) of asymptotically flat static spherically symmetric black holes and the properties of unstable null circular geodes…