203 citations · 3.4k across the 107 of their papers we have counts for
10 papers · 1 filter
Transition from inspiral to plunge for braneworld EMRI
Sajal Mukherjee, Sumanta Chakraborty
In the present article, we discuss the late inspiral and then the transition regime to the plunge phase of a secondary, less massive compact object into a more massive braneworld b…
Shielding a charged black hole
Justin C. Feng, Sumanta Chakraborty, Vitor Cardoso
We describe a shielding mechanism for a charged black hole immersed in a background involving charged matter fields, solely arising from the Einstein-Maxwell field equations. In pa…
Dynamical Love for area quantized black holes
Sreejith Nair, Sumanta Chakraborty, Sudipta Sarkar
We study the tidal deformability of horizonless exotic compact objects, with implications for area quantized black holes. Since, any such horizonless compact object, including area…
Hunting extra dimensions in the shadow of Sgr A*
Indrani Banerjee, Sumanta Chakraborty, Soumitra SenGupta
We show that the observed angular diameter of the shadow of the ultra compact object Sgr A*, favours the existence of an extra spatial dimension. This holds irrespective of the nat…
Gravitational wave memory in wormhole spacetimes
Indranil Chakraborty, Soumya Bhattacharya, Sumanta Chakraborty
Gravitational wave memory is studied in the context of a certain class of braneworld wormholes. Unlike other wormhole geometries, this novel class of wormholes do not require any e…
Echoes from braneworld wormholes
Shauvik Biswas, Mostafizur Rahman, Sumanta Chakraborty
We have studied the stability of wormhole geometries, under massless scalar, electromagnetic and axial gravitational perturbations, in the context of higher dimensional spacetimes.…
Universality of the Buchdahl sphere
Sumanta Chakraborty, Naresh Dadhich
Buchdahl sphere, the limiting stable isotropic stellar structure without exotic matter, plays a very important role in our understanding of how compact an astrophysical object can…
Strong cosmic censorship conjecture for a charged BTZ black hole
Chiranjeeb Singha, Sumanta Chakraborty, Naresh Dadhich
The strong cosmic censorship conjecture, whose validation asserts the deterministic nature of general relativity, has been studied for charged BTZ black holes in three dimensional…
Implications of the quantum nature of the black hole horizon on the gravitational-wave ringdown
Sumanta Chakraborty, Elisa Maggio, Anupam Mazumdar +1
Motivated by capturing putative quantum effects at the horizon scale, we model the black hole horizon as a membrane with fluctuations following a Gaussian profile. By extending the…
Scalar perturbations around rotating regular black holes and wormholes: quasi-normal modes, ergoregion instability and superradiance
Edgardo Franzin, Stefano Liberati, Jacopo Mazza +2
We study scalar test-field perturbations on top of a Kerr--black-bounce background, i.e. a family of rotating regular black holes and/or rotating traversable wormholes that can mim…