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Cyclic and heteroclinic flows near general static spherically symmetric black holes
(2016)
We investigate the Michel-type accretion onto a static spherically symmetric black hole. Using a Hamiltonian dynamical approach, we show that the standard method employed for tackling the accretion problem has masked some ...
Astrophysical flows near f (T) gravity black holes
(2016)
In this paper, we study the accretion process for fluids flowing near a black hole in the context of f (T) teleparallel gravity. Specifically, by performing a dynamical analysis by a Hamiltonian system, we are able to find ...
Shadow, quasinormal modes, and quasiperiodic oscillations of rotating Kaluza-Klein black holes
(2020)
In this paper we study the shadow of rotating Kaluza-Klein (KK) black holes and the connection between the shadow radius and the real part of quasinormal modes (QNMs) in the eiokonal limit. In addition we have explored the ...
Rotating normal and phantom Einstein-Maxwell-dilaton black holes: Geodesic analysis
(2019)
Depending on five parameters, rotating counterparts of Einstein-Maxwell-dilaton black holes are derived. We discuss their physical and geometric properties and investigate their null and timelike geodesics including circular ...
Shadow and quasinormal modes of a rotating loop quantum black hole
(2020)
In this paper, we construct an effective rotating loop quantum black hole (LQBH) solution, starting from the spherical symmetric LQBH by applying the Newman-Janis algorithm modified by Azreg-Ainou's noncomplexification ...
Gyroscope precession frequency analysis of a five-dimensional charged rotating Kaluza-Klein black hole
(2020)
We study the spin precession frequency of a test gyroscope attached to a stationary observer in the five-dimensional rotating Kaluza-Klein black hole (RKKBH). We derive the conditions under which the test gyroscope moves ...
Orbital mechanics and quasiperiodic oscillation resonances of black holes in Einstein-AEther theory
(2020)
In this paper, we study the motion of test particles around two exact charged black hole solutions in Einstein-AEther theory. Specifically, we first consider the quasiperiodic oscillations (QPOs) and their resonances ...
Shadow, quasinormal modes, and quasiperiodic oscillations of rotating Kaluza-Klein black holes
(2020)
In this paper we study the shadow of rotating Kaluza-Klein (KK) black holes and the connection between the shadow radius and the real part of quasinormal modes (QNMs) in the eiokonal limit. In addition we have explored the ...
Strong gravitational lensing by a charged Kiselev black hole
(2017)
We study the gravitational lensing scenario where the lens is a spherically symmetric charged black hole (BH) surrounded by quintessence matter. The null geodesic equations in the curved background of the black hole are ...
Quasinormal modes, quasiperiodic oscillations, and the shadow of rotating regular black holes in nonminimally coupled Einstein-Yang-Mills theory
(2021)
In this paper, we obtain an effective metric describing a regular and rotating magnetic black hole (BH) solution with a Yang-Mills electromagnetic source in Einstein-Yang-Mills (EYM) theory using the Newman-Janis (NJ) ...