53 citations · 149 across the 13 of their papers we have counts for
13 papers
Perturbations in the parametrized wormhole spacetime and their related quasinormal modes
Shauvik Biswas, Sayan Chakrabarti
We study electromagnetic perturbations and the associated quasinormal modes (QNMs) of parametrized static, spherically symmetric wormhole spacetimes, focusing on Damour-Solodukhin…
Can wormholes have vanishing Love numbers?
Shauvik Biswas
Wormholes are fascinating alternatives to black hole geometries. In this paper, we have studied a special case of wormhole solution in the context of spacetime. Our approxima…
The Physics of Black Holes and Their Environments: Consequences for Gravitational Wave Science
Vitor Cardoso, Shauvik Biswas, Subhodeep Sarkar
Ten short years ago, we had the rare privilege of witnessing the onset of a renaissance in science: humanity finally succeeded in its arduous quest to directly detect gravitational…
Excitation factors for horizonless compact objects: long-lived modes, echoes, and greybody factors
Romeo Felice Rosato, Shauvik Biswas, Sumanta Chakraborty +1
We present an analytical and numerical investigation of the quasinormal excitation factors of ultracompact horizonless objects. These systems possess long lived quasinormal modes w…
Overcharging Extremal Rotating Black Holes
Shauvik Biswas, Amruta Sadhu, Sudipta Sarkar
In this work, we use the weak cosmic censorship conjecture(WCC) to constrain black hole solutions in modified gravity theories. While Wald showed that extremal Kerr-Newman black ho…
Greybody factors, reflectionless scattering modes, and echoes of ultracompact horizonless objects
Romeo Felice Rosato, Shauvik Biswas, Sumanta Chakraborty +1
Motivated by a recently discovered connection between the greybody factors of black holes and the ringdown signal, we investigate the greybody factors of ultracompact horizonless o…
Accreting Schwarzschild-like compact object: Plasma-photon interaction and stability
Avijit Chowdhury, Shauvik Biswas, Sumanta Chakraborty
Accretion is a common phenomenon associated with any astrophysical compact object, which is best described by plasma, a state of matter composed of electrons and heavy ions. In thi…
Galactic Pure Lovelock Blackholes: Geometry, stability, and Hawking temperature
Chiranjeeb Singha, Shauvik Biswas
In this article, we will first-time model galactic black holes in pure Lovelock gravity. Even though working with higher spacetime dimensions, we assume (implicitly) the Hernquist-…
Galactic wormholes: Geometry, stability, and echoes
Shauvik Biswas, Chiranjeeb Singha, Sumanta Chakraborty
In this work, we present the environmental effects on wormholes residing in a galaxy. By this, we propose that these wormholes are mimickers of supermassive black holes residing at…
Looking for static interior solutions of Buchdahl star with in general relativity and pure Lovelock theories
Shauvik Biswas, Chiranjeeb Singha
We find static fluid solutions of Einstein and pure Lovelock equations with , , which could be possible models for the interior of a Buchdahl-like star. Buchdahl sta…
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.…
Massive Scalar Perturbation of Extremal Rotating Braneworld Black hole: Superradiant Stability Analysis
Shauvik Biswas
We analyse the superradiant stability of braneworld extremal Kerr and Kerr-Newman black holes under massive scalar perturbation. These black hole solutions differ from their four d…
Ergoregion instability and echoes for braneworld black holes: Scalar, electromagnetic and gravitational perturbations
Ramit Dey, Shauvik Biswas, Sumanta Chakraborty
In the context of higher dimensional braneworld scenario, we have argued that the occurrence of horizonless exotic compact objects, as an alternative to classical black holes, are…