181 citations · 1.1k across the 27 of their papers we have counts for
30 papers
Charging of rotating black holes: kinetic simulations of black hole magnetospheres
Martin Kološ, Farukh Abdulkhamidov, Arman Tursunov +2
Whether a rotating black hole (BH) immersed in an external magnetic field charges up to the Wald value , where and are the BH mass and spin parameter, and $…
Spinning charged test particle dynamics around a Schwarzschild black hole embedded in a homogeneous magnetic field
Misbah Shahzadi, Martin Kolos, Ondrej Zelenka +1
We study the dynamics of spinning charged test particles orbiting a Schwarzschild black hole immersed in a test uniform magnetic field. This setup provides a simple but physically…
Black hole in a combined magnetic field: ionized accretion disks in the jetlike and looplike configurations
Saltanat Kenzhebayeva, Saken Toktarbay, Arman Tursunov +1
Magnetic fields surrounding black holes are responsible for various astrophysical phenomena related to accretion processes and relativistic jets. Depending on the source, the confi…
Radiating particle in the vicinity of the weakly charged Schwarzschild black hole
Bakhtinur Juraev, Zdeněk Stuchlík, Arman Tursunov +1
It is well known that supermassive black holes in the centers of galaxies are capable of accelerating charged particles to very high energies. In many cases, the particle accelerat…
Structure-preserving numerical simulations of test particle dynamics around slowly rotating neutron stars within Hartle-Thorne approach
Misbah Shahzadi, Martin Kolos, Rabia Saleem +2
In this paper, we explore the chaotic signatures of the geodesic dynamics for particles moving in the slowly rotating Hartle-Thorne spacetime; an approximate solution of vacuum Ein…
String loop vibration around Schwarzschild black hole
Mariia Churilova, Martin Kološ, Zdeněk Stuchlík
String loop vibrations in a central plane of a Schwarzschild black hole are investigated for various string equations of state. We discuss string loop stability and derive frequenc…
Testing alternative spacetimes by high-frequency quasi-periodic oscillations observed in microquasars and active galactic nuclei
Misbah Shahzadi, Martin Kološ, Rabia Saleem +1
In this article, we try to capture the influence of deviation from standard Kerr black hole spacetime on observed high-frequency quasi-periodic oscillations signal. We explore the…
Charged particle dynamics in parabolic magnetosphere around Schwarzschild black hole
Martin Kološ, Misbah Shahzadi, Arman Tursunov
The study of charged particle dynamics in the combined gravitational and magnetic field can provide important theoretical insight into astrophysical processes around black holes. I…
Testing alternative theories of gravity by fitting the hot-spot data of Sgr A*
Misbah Shahzadi, Martin Kološ, Zdeněk Stuchlík +1
We are fitting dynamics of electrically neutral hot-spot orbiting around Sgr A* source in Galactic center, represented by various modifications of the standard Kerr black hole (BH)…
Electric Penrose process: high-energy acceleration of ionized particles by non-rotating weakly charged black hole
Arman Tursunov, Bakhtinur Juraev, Zdeněk Stuchlík +1
In many astrophysical scenarios the charge of the black hole is often neglected due to unrealistically large values of the charge required for the Reissner-Nordström spacetime metr…
Epicyclic oscillations in spinning particle motion around Kerr black hole applied in models fitting the quasi-periodic oscillations observed in quasars and microquasars
Misbah Shahzadi, Martin Kološ, Zdeněk Stuchlík +1
The study of the quasi-periodic oscillations (QPOs) of X-ray flux observed in the stellar-mass black hole (BH) binaries or quasars can provide a powerful tool for testing the pheno…
Radiative Penrose process: Energy Gain by a Single Radiating Charged Particle in the Ergosphere of Rotating Black Hole
Martin Kološ, Arman Tursunov, Zdeněk Stuchlík
We demonstrate an extraordinary effect of energy gain by a single radiating charged particle inside the ergosphere of a Kerr black hole in presence of magnetic field. We solve nume…
Supermassive black holes as possible sources of ultra high energy cosmic rays
Arman Tursunov, Zdeněk Stuchlík, Martin Kološ +2
Production and acceleration mechanisms of ultra-high-energy cosmic rays (UHECRs) of energy eV, clearly beyond the GZK-cutoff limit remain unclear that points to exotic na…
Effect of Electromagnetic Interaction on Galactic Center Flare Components
Arman Tursunov, Michal Zajaček, Andreas Eckart +5
Recently, near-infrared GRAVITY@ESO observations at have announced the detection of three bright "flares" in the vicinity of the Galactic center supermassive black…
Multi-messenger signals from short gamma ray bursts
Agnieszka Janiuk, Kostas Sapountzis, Bestin James +1
We present the results of simulations done with the code HARM-COOL developed in the CTP PAS Warsaw research group over the years 2017-2019. It is based in the original GR MHD schem…
Determination of chaotic behaviour in time series generated by charged particle motion around magnetized Schwarzschild black holes
Radim Pánis, Martin Kološ, Zdeněk Stuchlík
We study behaviour of ionized region of a Keplerian disk orbiting a Schwarzschild black hole immersed in an asymptotically uniform magnetic field. In dependence on the magnetic par…
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…
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 mass, spin and magnetic field of microquasar H~1743-322 from observations of QPOs
Arman Tursunov, Martin Kološ
The study of quasi-periodic oscillations (QPOs) of X-ray flux observed in many microquasars can provide a powerful tool for testing of the phenomena occurring in strong gravity reg…
Possible signature of magnetic fields related to quasi-periodic oscillation observed in microquasars
Martin Kološ, Arman Tursunov, Zdeněk Stuchlík
The study of quasi-periodic oscillations (QPOs) of X-ray flux observed in the stellar-mass black hole binaries can provide a powerful tool for testing of the phenomena occurring in…
Controversy of the GRO J1655-40 black hole mass and spin estimates and its possible solutions
Zdeněk Stuchlík, Martin Kološ
Estimates of the black hole mass and dimensionless spin in the microquasar GRO J1655-40 implied by strong gravity effects related to the timing and spectral measurements ar…
Acceleration of charged particles due to chaotic scattering in the combined black hole gravitational field and asymptotically uniform magnetic field
Zdeněk Stuchlík, Martin Kološ
To test the role of large-scale magnetic fields in accretion processes, we study dynamics of charged test particles in vicinity of a black hole immersed into an asymptotically unif…
Quasi-harmonic oscillatory motion of charged particles around a Schwarzschild black hole immersed in an uniform magnetic field
Martin Kološ, Zdeněk Stuchlík, Arman Tursunov
In order to test the role of large-scale magnetic fields in quasiperiodic oscillation phenomena observed in microquasars, we study oscillatory motion of charged particles in vicini…
Test of the string loop oscillation model using kHz quasiperiodic oscillations in a neutron star binary
Zdeněk Stuchlík, Martin Kološ
The model of current-carrying string loop oscillations is tested to explain the special set of frequencies related to the high-frequency quasiperiodic oscillations (HF QPOs) observ…