On the properties of a deformed extension of the NUT space-time

In the present paper, we have investigated the motion of charged particles together with magnetic dipoles to determine how well the spacetime deviation parameter $$\epsilon $$ ϵ and external uniform magnetic field can mimic the spin of a rotating Kerr black hole. Investigation of charged particle motion has shown that the deviation parameter $$\epsilon $$ ϵ in the absence of an external magnetic fields can mimic the rotation parameter of the Kerr spacetime up to $$a/M \approx 0.5$$ a / M ≈ 0.5 . The combination of an external magnetic field and deviation parameter can do even a better job mimicking the rotation parameter up to $$a/M\simeq 0.93$$ a / M ≃ 0.93 , which corresponds to the rapidly rotating case. Study of the dynamics of the magnetic dipoles around quasi-Schwarzschild black holes in the external magnetic field has shown that there are degeneracy values of the ISCO radius of test particles at $$\epsilon _{cr}>\epsilon \ge 0.35$$ ϵ cr > ϵ ≥ 0.35 which may lead to two different values of the innermost stable circular orbit (ISCO) radius. When the deviation parameter is in the range of $$\epsilon \in (-1,\ 1)$$ ϵ ∈ ( - 1 , 1 ) , it can mimic the spin of a rotating Kerr black hole in the range $$a/M \in (0.0537, \ 0.3952)$$ a / M ∈ ( 0.0537 , 0.3952 ) for magnetic dipoles with values of the magnetic coupling parameter $$\beta \in [-0.25,\ 0.25]$$ β ∈ [ - 0.25 , 0.25 ] in corotating orbits.

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“…The authors of Refs. [30][31][32][33][34][35][36][37][38] have studied the deformed spacetime of black holes and its properties.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of charged particles and magnetic dipoles around magnetized quasi-Schwarzschild black holes

et al. 2021

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“…Motion of particles in the vicinity of massive compact objects is a well-known tool to probe the properties of the geometry in the exterior of such compact objects. Particle dynamics in the space-time of various gravitating compact objects have been extensively studied in the literature, for example see our preceding recent papers [55][56][57][58][59][60]. We also refer the reader to take a look at valuable works devoted to the investigation of the properties of space-time around various wormhole solutions [61,62].…”

Section: Introductionmentioning

confidence: 99%

Particle motion around a static axially symmetric wormhole

Narzilloev,

Malafarina,

Abdujabbarov

et al. 2021

Preprint

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We consider the properties of a static axially symmetric wormhole described by an exact solution of Einstein's field equations and investigate how we can distinguish such an hypothetical object from a black hole. To this aim, we explore the motion of test particles and photons in the wormhole's space-time and compare it with the particle dynamics in the well known space-times of Schwarzschild and Kerr black holes. We show that precise simultaneous measurement of test particle motion and photon motion may provide the means to distinguish the wormhole geometry from that of a black hole.

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“…Deformed spacetime properties have been studied in Refs. [38][39][40][41][42][43][44][45][46][47]. The prospects of cosmological dark energy for a dynamical theory have been discussed in [48], and the cosmological transitions with a change in metric signature have been investigated in [49].…”

Section: Introductionmentioning

confidence: 99%

Regular Bardeen Black Holes in Anti-de Sitter Spacetime versus Kerr Black Holes through Particle Dynamics

et al. 2021

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In this work, test particle dynamics around a static regular Bardeen black hole (BH) in Anti-de Sitter spacetime has been studied. It has been shown for neutral test particles that parameters of a regular Bardeen black hole in Anti-de Sitter spacetime can mimic the rotation parameter of the Kerr metric up to the value a≈0.9 providing the same innermost stable circular orbit (ISCO) radius. We have also explored the dynamics of magnetized particles with a magnetic dipole moment around a magnetically charged regular Bardeen black hole in Anti-de Sitter spacetime. As a realistic astrophysical scenario of the study, we have treated neutron stars orbiting a supermassive black hole (SMBH), in particular, the magnetar PSR J1745-2900 orbiting Sgr A* with the parameter β=10.2, as magnetized test particles. The magnetized particles dynamics shows that the parameter β, negative values of cosmological constant and magnetic charge parameter of the central BH cause a decrease in the ISCO radius. We have compared the effects of the magnetic charge of the Bardeen BH with the spin of rotating Kerr BH and shown that magnetic charge parameter can mimic the spin in the range a/M≃(0,0.7896) when Λ=0 at the range of its values g/M≃(0,0.648).

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On the properties of a deformed extension of the NUT space-time

Cited by 22 publications

References 56 publications

Dynamics of charged particles and magnetic dipoles around magnetized quasi-Schwarzschild black holes

Dynamics of charged particles and magnetic dipoles around magnetized quasi-Schwarzschild black holes

Particle motion around a static axially symmetric wormhole

Regular Bardeen Black Holes in Anti-de Sitter Spacetime versus Kerr Black Holes through Particle Dynamics

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