72 citations · 578 across the 38 of their papers we have counts for
21 papers · 1 filter
Exploring PSR J0901-4046 as an ultra-slowly rotating neutron star versus a white dwarf
Banibrata Mukhopadhyay, Nirupam Roy, Zenia Zuraiq +2
The source PSR J0901-4046 shows a very long rotational period, of s. In fact, its long period suggests that it could be a white dwarf. We examine the properties of…
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…
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…
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…
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…
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,…
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…
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…
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…
Does the gravitomagnetic monopole exist? A clue from a black hole x-ray binary
Chandrachur Chakraborty, Sudip Bhattacharyya
The gravitomagnetic monopole is the proposed gravitational analogue of Dirac's magnetic monopole. However, an observational evidence of this aspect of fundamental physics was elusi…
Gravitomagnetism and Pulsar Beam Precession near a Kerr Black Hole
Prashant Kocherlakota, Pankaj S. Joshi, Sudip Bhattacharyya +3
A rotating black hole causes the spin-axis of a nearby pulsar to precess due to geodetic and gravitomagnetic frame-dragging effects. The aim of our theoretical work here is to expl…
A tilted and warped inner accretion disc around a spinning black hole: an analytical solution
Chandrachur Chakraborty, Sudip Bhattacharyya
Inner accretion disc around a black hole provides a rare, natural probe to understand the fundamental physics of the strong gravity regime. A possible tilt of such a disc, with res…
Gravitomagnetic effect in magnetized neutron stars
Debarati Chatterjee, Chandrachur Chakraborty, Debades Bandyopadhyay
Rotating bodies in General Relativity produce frame dragging, also known as the {\it gravitomagnetic effect} in analogy with classical electromagnetism. In this work, we study the…
Dragging of inertial frames inside the rotating neutron stars
Chandrachur Chakraborty, Kamakshya Prasad Modak, Debades Bandyopadhyay
We derive the exact frame-dragging rate inside rotating neutron stars. This formula is applied to show that the frame-dragging rate monotonically decreases from the centre to the s…