Abstract
In the present paper, we investigate the dynamics of magnetized particles around magnetically and electrically Reissner–Nordström (RN) black hole. The main idea of the work is to distinguish the effects of electric and magnetic charges of the RN black hole and spin of the rotating Kerr black hole through the dynamics of the magnetized particles. In this study, we have treated a magnetized neutron star as a magnetized test particle, in particular, the magnetar SGR (PSR) J1745-2900 orbiting around the supermassive black hole Sagittarius A* (SMBH SgrA*) with the magnetic interaction parameter b=0.716 and the parameter beta =10.2. The comparison of the effects of the magnetic and electric charges, and magnetic interaction parameters on the dynamics of the magnetar modeled as a magnetized particle near the SMBH Sgr A* has shown that the magnetic charge of the RN black hole can mimic the spin parameter of a rotating Kerr black hole up to a/M simeq 0.82. The external magnetic field can mimic the magnetic charge of the RN black hole up to Q_m/M=0.4465. We have shown that the electric charge of the RN black hole can mimic the black hole magnetic charge up to Q_m/M=0.5482 and the magnetic field interaction with the magnetized particle acts against the increase of the mimicking value of the black hole spin parameter. The studies may be helpful to explain the observability of radio pulsars around the SMBH SgrA* system and taking it as a real astrophysical laboratory to get more precise constraints on the central black hole and dominated parameters of the alternate gravity. Finally, we have investigated the effects of magnetic and electric charge of the RN black hole in the center-of-mass energy of head-on collisions of magnetized particles with neutral, electrically charged, and magnetized particles. Both electric and magnetic charges of the RN black hole would lead to an increase in the center of the mass–energy of the collisions.
Highlights
Studies of dynamics of particle motion around a compact gravitational object are one of the interesting and highly motivated special subjects in relativistic astrophysics
We have explored the dynamics of magnetized particles in the vicinity of both a magnetically and electrically charged RN black hole
In the case of an electrically charged RN black hole due to the absence of interaction between the electric charge of the black hole and the dipole moment of the magnetized particles, we have assumed that the black hole is immersed in an external asymptotically uniform magnetic field
Summary
Studies of dynamics of particle motion around a compact gravitational object are one of the interesting and highly motivated special subjects in relativistic astrophysics. They may be helpful in developing new approaches to describing the gravitational and electromagnetic interaction in both the strong-field and the weak-field regimes. Black holes as a simple astrophysical object can be described with the black hole’s total mass M, the spin parameter a, and electric/magnetic charge Q. Due to the recent direct detection of gravitational waves from the close binary black holes [3,4,5] and neutron stars mergers by the LIGO-VIRGO Collaboration, observations of the SMBH M87 image by Event Horizon Telescope (EHT) consortium [6,7], the gravitational redshift in strong gravity regime in observations of S2 star dynamics in SgrA* close environment by GRAVITY Collaboration [8,9] and other relevant recent astrophysical observations of black holes
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