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Advanced LIGO detector performance in the fourth observing run
E. Capote, W. Jia, N. Aritomi +193
On May 24th, 2023, the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO), joined by the Advanced Virgo and KAGRA detectors, began the fourth observing run for a t…
Parameter estimation of hairy Kerr black holes from its shadow and constraints from M87*
Misba Afrin, Rahul Kumar, Sushant G. Ghosh
The recently obtained hairy Kerr black holes, due to additional sources or surrounding fluid, like dark matter, with conserved energy-momentum tensor, have a deviation and prim…
Parameters estimation and strong gravitational lensing of nonsingular Kerr-Sen black holes
Sushant G. Ghosh, Rahul Kumar, Shafqat Ul Islam
The recent time witnessed a surge of interest in strong gravitational lensing by black holes is due to the Event Horizon Telescope (EHT) results, which suggest comparing the black…
Testing Rotating Regular Metrics as Candidates for Astrophysical Black Holes
Rahul Kumar, Amit Kumar, Sushant G. Ghosh
The Event Horizon Telescope, a global submillimeter wavelength very long baseline interferometry array, produced the first image of supermassive black hole M87* showing a ring of d…
Phase transition of AdS black holes in 4D EGB gravity coupled to nonlinear electrodynamics
Sushant G. Ghosh, Dharm Veer Singh, Rahul Kumar +1
Einstein-Gauss-Bonnet (EGB) gravity is an outcome of quadratic curvature corrections to the Einstein-Hilbert gravity action in the form of a Gauss-Bonnet (GB) term in dime…
Gravitational lensing by charged black hole in regularized Einstein-Gauss-Bonnet gravity
Rahul Kumar, Shafqat Ul Islam, Sushant G. Ghosh
Among the higher curvature gravities, the most extensively studied theory is the so-called Einstein-Gauss-Bonnet (EGB) gravity, whose Lagrangian contains Einstein term with the GB…
Photon ring structure of rotating regular black holes and no-horizon spacetimes
Rahul Kumar, Sushant G. Ghosh
The Kerr black holes possess a photon region with prograde and retrograde orbits radii, respectively, and , and thereby always cast a clos…
Gravitational lensing by black holes in the Einstein-Gauss-Bonnet gravity
Shafqat Ul Islam, Rahul Kumar, Sushant G. Ghosh
Recently, a non-trivial Einstein-Gauss-Bonnet (EGB) theory of gravity, by rescaling the GB coupling parameter as , was formulated in \cite{Glavan:2019inb}, which bypa…
Rotating black holes in Einstein-Gauss-Bonnet gravity and its shadow
Rahul Kumar, Sushant G. Ghosh
Recently there has been a surge of interest in regularizing, a limit of, the Einstein-Gauss-Bonnet (EGB) gravity, and the resulting regularized EGB gravity has non…
Shadow cast and deflection of light by charged rotating regular black holes
Rahul Kumar, Sushant G. Ghosh, Anzhong Wang
We discuss the horizon properties, shadow cast, and the weak gravitational lensing of charged rotating regular black holes, which in addition to mass () and rotation parameter (…
Shadow and deflection angle of rotating black hole in asymptotically safe gravity
Rahul Kumar, Balendra Pratap Singh, Sushant G. Ghosh
We analytically investigate the shadows cast by rotating black holes in the asymptotically safe gravity (ASG) by deriving complete null geodesics and observables using the Hamilton…
Rotating black string in dRGT massive gravity
Sushant G. Ghosh, Rahul Kumar, Lunchakorn Tannukij +1
One of the solutions of Einstein field equation with cylindrical symmetry is known as black string solution. In this work, the rotating black string solution in dRGT massive gravit…
Black Hole Parameter Estimation from Its Shadow
Rahul Kumar, Sushant G. Ghosh
The Event Horizon Telescope (EHT), a global submillimeter wavelength very long baseline interferometry array, unveiled event-horizon-scale images of the supermassive black hole M87…
Shadows of black hole surrounded by anisotropic fluid in Rastall theory
Rahul Kumar, Balendra Pratap Singh, Md Sabir Ali +1
Due to the gravitational lensing effect, a black hole casts a shadow larger than its horizon over a bright background, and the shape and size can be calculated. The Event Horizon T…
Rotating black hole in Rastall theory
Rahul Kumar, Sushant G. Ghosh
Rotating black hole solutions in theories of modified gravity are important as they offer an arena to test these theories through astrophysical observation. The non-rotating black…
Accretion onto a noncommutative geometry inspired black hole
Rahul Kumar, Sushant G. Ghosh
The spherically symmetric accretion onto a noncommutative (NC) inspired Schwarzschild black hole is treated for a polytropic fluid. The critical accretion rate , sonic spe…
Parameter estimation for compact binary coalescence signals with the first generation gravitational-wave detector network
the LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +801
Compact binary systems with neutron stars or black holes are one of the most promising sources for ground-based gravitational wave detectors. Gravitational radiation encodes rich i…