753 citations · 1.1k across the 14 of their papers we have counts for
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Testing the Kerr nature with binary black hole inspirals
Swarnim Shashank, Cosimo Bambi, Rittick Roy
The theory of general relativity (GR) is the standard framework for the description of gravitation and the geometric structure of spacetime. With the recent advancement of observat…
Numerical parameterization of stationary axisymmetric black holes in a theory agnostic framework
Olzhas Mukazhanov, Rittick Roy, Temurbek Mirzaev +1
The pursuit of a comprehensive theory of gravity has led to the exploration of various alternative models, necessitating a model-independent framework. The Konoplya-Rezzolla-Zhiden…
Prospects for Future Experimental Tests of Gravity with Black Hole Imaging: Spherical Symmetry
Prashant Kocherlakota, Luciano Rezzolla, Rittick Roy +1
Astrophysical black holes (BHs) are universally expected to be described by the Kerr metric, a stationary, vacuum solution of general relativity (GR). Indeed, by imaging M87$^\star…
Testing regular black holes with X-ray and GW data
Shafqat Riaz, Swarnim Shashank, Rittick Roy +5
The presence of spacetime singularities in physically relevant solutions of the Einstein Equations is normally interpreted as a symptom of the breakdown of classical general relati…
Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A
Sunny Vagnozzi, Rittick Roy, Yu-Dai Tsai +12
Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime. We conside…
Quasinormal modes and greybody factors of the novel four dimensional Gauss-Bonnet black holes in asymptotically de Sitter space time: Scalar, Electromagnetic and Dirac perturbations
Saraswati Devi, Rittick Roy, Sayan Chakrabarti
We find the low lying quasinormal mode frequencies of the recently proposed novel four dimensional Gauss-Bonnet de Sitter black holes for scalar, electromagnetic and Dirac field pe…
A study on black hole shadows in asymptotically de Sitter spacetimes
Rittick Roy, Sayan Chakrabarti
Previous works on black hole shadows have been primarily focused on studying shadows in asymptotically flat and anti-de Sitter space times. In the present work, we find general exp…
Mode stability of a near-extremal Kerr superspinar
Rittick Roy, Prashant Kocherlakota, Pankaj S. Joshi
We study here the quasi-normal mode stability of a near-extremal Kerr superspinar, an exotic spinning compact object that exceeds the Kerr bound, under gravitational perturbations.…
Evolution of black hole shadow in the presence of ultralight bosons
Rittick Roy, Urjit A. Yajnik
Kerr black holes coupled to quantized bosonic fields display a special version of the Hawking effect, governed by the superradiance condition. This leads to rapid growth of boson c…