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Constraining the charge of the Galactic centre black hole
Michal Zajaček, Arman Tursunov, Andreas Eckart +6
In this contribution, we summarize our results concerning the observational constraints on the electric charge associated with the Galactic centre black hole - Sgr A*. According to…
Einstein-Klein-Gordon by gravitational decoupling
J Ovalle, R Casadio, R da Rocha +2
We investigate how a spherically symmetric scalar field can modify the Schwarzschild vacuum solution when there is no exchange of energy-momentum between the scalar field and the c…
Spherical photon orbits in the field of Kerr naked singularities
Daniel Charbulák, Zdeněk Stuchlík
For the Kerr naked singularity (KNS) spacetimes, we study properties of spherical photon orbits (SPOs) confined to constant Boyer-Lindquist radius r. Some new features of the SPOs…
Light escape cones in local reference frames of Kerr-de Sitter black hole spacetimes and related black hole shadows
Zdeněk Stuchlík, Daniel Charbulák, Jan Schee
We construct the light escape cones of isotropic spot sources of radiation residing in special classes of reference frames in the Kerr-de Sitter (KdS) black hole spacetimes, namely…
Relating Kerr SMBHs in Active Galactic Nuclei to RAD configurations
D. Pugliese, Z. Stuchlik
There is strong observational evidence that many active galactic nuclei (AGNs) harbour supermassive black holes (SMBHs), demonstrating multi-accretion episodes during their lifetim…
Charged string loops in Reissner-Nordström black hole background
Tursinbay Oteev, Martin Kološ, Zdeněk Stuchlík
We study the motion of current carrying charged string loops in the Reissner-Nordström black hole background combining the gravitational and electromagnetic field. Introducing new…
Black holes by gravitational decoupling
J Ovalle, R Casadio, R da Rocha +2
We investigate how a spherically symmetric fluid modifies the Schwarzschild vacuum solution when there is no exchange of energy-momentum between the fluid and the central source of…
Proto-jets configurations in RADs orbiting a Kerr SMBH: symmetries and limiting surfaces
D. Pugliese, Z. Stuchlik
Ringed accretion disks (RADs) are agglomerations of perfect-fluid tori orbiting around a single central attractor that could arise during complex matter inflows in active galactic…
Radiation reaction of charged particles orbiting magnetized Schwarzschild black hole
Arman Tursunov, Martin Kološ, Zdeněk Stuchlík +1
In many astrophysically relevant situations radiation reaction force acting upon a charge can not be neglected and the question arises about the location and stability of circular…
Constraints on two accretion disks centered on the equatorial plane of a Kerr SMBH
D. Pugliese, Z. Stuchlik
The possibility that two toroidal accretion configurations may be orbiting around a~super--massive Kerr black hole has been addressed. Such tori may be formed during different stag…