72 citations · 578 across the 38 of their papers we have counts for
38 papers
Transmutation Timescales for Dark Matter Induced Collapse of Compact Stars into Black Holes
H. A. Adarsha, Chandrachur Chakraborty, Sudip Bhattacharyya
Ultra-heavy asymmetric dark matter (DM) particles captured by compact stars can thermalize, self-gravitate, and collapse to form an endoparasitic black hole (EBH), whose subsequent…
Tilted thin accretion disks in the full Kerr spacetime and their implications
K. S. Sruthy, Chandrachur Chakraborty, Sudip Bhattacharyya
We derive a steady-state warped-disk equation in the full Kerr spacetime to study the tilt dynamics of a thin, viscous accretion disk around a spinning collapsed object. The formul…
Probing (sub-)solar-mass black holes and superspinars with current and next-generation gravitational-wave observatories
K. S. Sruthy, N. V. Krishnendu, Chandrachur Chakraborty +1
Gravitational-wave observations provide a powerful probe of compact objects and strong-field gravity. In this work, we investigate the detectability of binaries containing (sub-)so…
Orbital dynamics and precession in magnetized Kerr spacetime
Karthik Iyer, Chandrachur Chakraborty
We study the orbital structure and precession dynamics of neutral test particles in the magnetized Kerr black hole (MKBH) spacetime-an exact electrovacuum solution of the Einstein-…
Accretion inside astrophysical objects : Effects of rotation and viscosity
H. A. Adarsha, Chandrachur Chakraborty, Sudip Bhattacharyya
Sub-solar mass black holes could show up in gravitational wave observations in future and near-solar mass black holes might have been involved in the events GW190425 and GW190814.…
Magnetically arrested transmutation of a compact star
H. A. Adarsha, Chandrachur Chakraborty, Sudip Bhattacharyya
We introduce a novel mechanism -- Magnetically Arrested Transmutation (MAT) -- which could be a viable model to account for the observed over-representation of magnetic white dwarf…
Spin Precession in magnetized Kerr spacetime
Karthik Iyer, Chandrachur Chakraborty
We present an exact analytical investigation of spin precession for a test gyroscope in the magnetized Kerr spacetime--an exact electrovacuum solution to the Einstein-Maxwell equat…
Study of a Tilted Thin Accretion Disk around a Kerr-Taub-NUT black hole
Gargi Sen, Chandrachur Chakraborty, Sudip Bhattacharyya +3
The accreting collapsed object GRO J1655-40 could contain the gravitomagnetic monopole (GMM), and it was shown to be better described by the Kerr-Taub-NUT (KTN) spacetime instead o…
Low Mass Naked Singularities from Dark Core Collapse
Chandrachur Chakraborty, Sudip Bhattacharyya, Pankaj S. Joshi
Near-solar mass black holes (BHs) could have been involved in the two recent gravitational wave events, GW190425 and GW190814. Since such a low mass BH cannot be formed via stellar…
The Lunar Gravitational-wave Antenna: Mission Studies and Science Case
Parameswaran Ajith, Pau Amaro Seoane, Manuel Arca Sedda +83
The Lunar Gravitational-wave Antenna (LGWA) is a proposed array of next-generation inertial sensors to monitor the response of the Moon to gravitational waves (GWs). Given the size…
Magnetic Penrose process in the magnetized Kerr spacetime
Chandrachur Chakraborty, Parth Patil, G. Akash
Magnetic Penrose process (MPP) could be highly efficient (efficiency can even exceed ) for extracting the energy from a Kerr black hole, if it is immersed in a mG order magn…
Near- and sub-solar-mass naked singularities and black holes from transmutation of white dwarfs
Chandrachur Chakraborty, Sudip Bhattacharyya
Recent gravitational wave events have suggested the existence of near-solar-mass black holes which cannot be formed via stellar evolution. This has opened up a tantalizing possibil…
Geometric phase in Taub-NUT spacetime
Chandrachur Chakraborty, Banibrata Mukhopadhyay
Constructing the Hamiltonian in the -representation, we explore the geometric phase in the Taub-NUT spacetime, which is spherically symmetric and stationary. The geometric phase…
Primordial Black Holes having Gravitomagnetic Monopole
Chandrachur Chakraborty, Sudip Bhattacharyya
A primordial black hole (PBH) is thought to be made of the regular matter or ordinary mass () only, and hence could have already been decayed due to the Hawking radiation if its…
Black holes shielded by magnetic fields
Chandrachur Chakraborty
Black holes (BHs) formed by collapsing and/or merging of magnetized progenitors, have magnetic fields penetrating the event horizon, and there are several possible scenarios. Thus,…
Gravitational Larmor precession
Chandrachur Chakraborty, Parthasarathi Majumdar
Inspired by the reported existence of substantive magnetic fields in the vicinity of the central supermassive black holes in Sagitarius A* and Messier 87*, we consider test particl…
Spin precession in the gravity wave analogue black hole spacetime
Chandrachur Chakraborty, Banibrata Mukhopadhyay
It was predicted that the spin precession frequency of a stationary gyroscope shows various anomalies in the strong gravity regime if its orbit shrinks, and eventually its precessi…
Investigating the existence of gravitomagnetic monopole in M87*
M. Ghasemi-Nodehi, Chandrachur Chakraborty, Qingjuan Yu +1
We examine the possibility for the existence of gravitomagnetic monopole () in M87* by using the results obtained from its first Event Horizon Telescope image. By numerically…
Gravitational analog of Faraday rotation in the magnetized Kerr and Reissner-Nordström spacetimes
Chandrachur Chakraborty
It is known that the gravitational analog of the Faraday rotation arises in the rotating spacetime due to the nonzero gravitomagnetic field. In this paper, we show that it also ari…
Estimation of the jet inclination angle for the TDE Swift J1644+57
Sudip Chakraborty, Sudip Bhattacharyya, Chandrachur Chakraborty +1
An estimate of the jet inclination angle relative to the accreting black hole's spin can be useful to probe the jet triggering mechanism and the disc--jet coupling. A Tidal Disrupt…
Alignment and precession of a black hole misaligned with its accretion disc: Application to Low Mass X-ray Binaries
Srimanta Banerjee, Chandrachur Chakraborty, Sudip Bhattacharyya
A thin viscous accretion disc around a Kerr black hole, which is warped due to the Lense-Thirring (LT) effect, was shown to cause the spin axis of the black hole to precess and ali…
Circular orbits in Kerr-Taub-NUT spacetime and their implications for accreting black holes and naked singularities
Chandrachur Chakraborty, Sudip Bhattacharyya
It has recently been proposed that the accreting collapsed object GRO J1655--40 could contain a non-zero gravitomagnetic monopole, and hence could be better described with the more…
Spinning Gyroscope in an Acoustic Black Hole : Precession Effects and Observational Aspects
Chandrachur Chakraborty, Parthasarathi Majumdar
The exact precession frequency of a freely-precessing test gyroscope is derived for a dimensional rotating acoustic black hole analogue spacetime, without making the somewhat…
A study of a tilted thin inner accretion disk around a spinning black hole
Srimanta Banerjee, Chandrachur Chakraborty, Sudip Bhattacharyya
The inner part of a thin accretion disk around a Kerr black hole can serve as an important tool to study the physics of the strong gravity regime. A tilt in such a disk with respec…