Shadow of novel rotating black hole in GR coupled to nonlinear electrodynamics and constraints from EHT results

被引:13
作者
Raza, Muhammad Ali [1 ]
Rayimbaev, Javlon [2 ,3 ,4 ,5 ]
Sarikulov, Furkat [6 ,7 ]
Zubair, M. [1 ]
Ahmedov, Bobomurat [2 ,8 ]
Stuchlik, Zdenek [9 ]
机构
[1] COMSATS Univ Islamabad, Dept Math, Lahore Campus, Lahore, Pakistan
[2] Natl Res Univ TIIAME, Inst Fundamental & Appl Res, Kori Niyoziy 39, Tashkent 100000, Uzbekistan
[3] Univ Tashkent Appl Sci, Gavhar Str 1, Tashkent 100149, Uzbekistan
[4] Tashkent State Tech Univ, Tashkent 100095, Uzbekistan
[5] Samarkand State Univ, Dept Nucl Phys & Astron, Samarkand 140104, Uzbekistan
[6] New Uzbekistan Univ, Sch Math & Nat Sci, Movarounnahr Str 1, Tashkent 100000, Uzbekistan
[7] Ulugh Beg Astron Inst, Astron Str 33, Tashkent 100052, Uzbekistan
[8] Natl Univ Uzbekistan, Inst Theoret Phys, Tashkent 100174, Uzbekistan
[9] Silesian Univ Opava, Inst Phys, Res Ctr Theoret Phys & Astrophys, Bezrucovo Nam 13, CZ-74601 Opava, Czech Republic
来源
PHYSICS OF THE DARK UNIVERSE | 2024年 / 44卷
关键词
Black holes; Shadow; Photonsphere; EHT results; Nonlinear electrodynamics; QUASI-NORMAL MODES; PARAMETER-ESTIMATION; FIELD; VI; I;
D O I
10.1016/j.dark.2024.101488
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study the optical properties of spacetime around a novel black hole in general relativity coupled to nonlinear electrodynamics, which is asymptotically flat. First, we study the angular velocity and Lyapunov exponent in unstable photon circular orbits in the novel spherically symmetric black hole spacetime. Later, we obtain the rotating black hole solution using the Newman-Janis algorithm and determine the event horizon properties of the black hole. We analyze the effective potential for the circular motion of photons in the spacetime of the novel rotating black hole. Also, we analyze the photon sphere around the novel black hole and its shadow using celestial coordinates. We obtain that an increase of the black hole spin and charge as well as nonlinear electrodynamics field nonlinearity parameters causes an increase in the distortion parameter of the black hole shadow, while, the area of the shadow and its oblateness decrease. Moreover, we also obtain the constraint values for the black hole charge and the nonlinearity parameters using Event Horizon Telescope data from shadow sizes of supermassive black holes Sgr A* and M87*. Finally, the emission rate of black hole evaporation through Hawking radiation is also studied.
引用
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页数:16
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