Particle motion around generic black holes coupled to non-linear electrodynamics

@article{36728,
   author = {Vrba, Jaroslav and Abdujabbarov, Ahmadjon and Tursunov, Arman and Ahmedov, Bobomurot and Stuchlík, Zdeněk},
   article_number = {9},
   doi = {http://dx.doi.org/10.1140/epjc/s10052-019-7286-2},
   keywords = {generic black hole; non-linear electrodynamics; particle motion},
   language = {eng},
   issn = {1434-6044},
   journal = {European Physical Journal C},
   title = {Particle motion around generic black holes coupled to non-linear electrodynamics},
   url = {https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-019-7286-2},
   volume = {79},
   year = {2019}
}

TY  - JOUR
ID  - 36728
AU  - Vrba, Jaroslav - Abdujabbarov, Ahmadjon - Tursunov, Arman - Ahmedov, Bobomurot - Stuchlík, Zdeněk
PY  - 2019
TI  - Particle motion around generic black holes coupled to non-linear electrodynamics
JF  - European Physical Journal C
VL  - 79
IS  - 9
SP  - "778-1"-"778-15"
EP  - "778-1"-"778-15"
SN  - 14346044
KW  - generic black hole
KW  - non-linear electrodynamics
KW  - particle motion
UR  - https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-019-7286-2
L2  - https://link.springer.com/article/10.1140%2Fepjc%2Fs10052-019-7286-2
N2  - We study spherically symmetric magnetically charged generic black hole solutions of general relativity coupled to non-linear electrodynamics (NED). For characteristic values of the generic spacetime parameters we give the position of horizons in dependence on the charge parameter, demonstrating separation of the black hole and no-horizon solutions, and possibility of existence of solutions containing three horizons. We show that null, weak and strong energy conditions are violated when the outer horizon is approaching the center. We study effective potentials for photons and massive test particles and location of circular photon orbits (CPO) and innermost stable circular orbit (ISCO). We show that the unstable photon orbit can become stable, leading to the possibility of photon capture which affects on silhouette of the central object. The position of ISCO approaches the horizon with increasing charge parameter q and the energy at ISCO decreases with increasing charge parameter. We investigate this phenomenon and summarize for a variety of the generic spacetime parameters the upper estimate on the spin parameter of the Kerr black which can be mimicked by the generic charged black hole solutions.
ER  - 

VRBA, Jaroslav, Ahmadjon ABDUJABBAROV, Arman TURSUNOV, Bobomurot AHMEDOV and Zdeněk STUCHLÍK. Particle motion around generic black holes coupled to non-linear electrodynamics. \textit{European Physical Journal C}. 2019, vol.~79, No~9, p.~''778-1''-''778-15'', 15 pp. ISSN~1434-6044. Available from: https://dx.doi.org/10.1140/epjc/s10052-019-7286-2.