Particle motion around a static axially symmetric wormhole

Narzilloev, Bakhtiyor; Malafarina, Daniele; Abdujabbarov, Ahmadjon; Ahmedo, Bobomurat; Bambi, Cosimo

doi:10.48550/arxiv.2105.09174

Cited by 3 publications

(4 citation statements)

References 58 publications

(71 reference statements)

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“…This is a question of the same order as the origin of point naked singularities, as well as other exotic structures such as bosonic stars, wormholes, etc. [4][5][6][7][8][9][10][11][12][13][15][16][17][18][19][20][21][22][23][24][25][26]. We note, however, that for some sets of configuration parameters, it could be difficult to distinguish SS from ordinary black holes relying upon the accretion disk structures.…”

Section: Discussionmentioning

confidence: 82%

“…This is one of the motivations for many theoretical works devoted to non-canonical and even exotic solutions of General Relativity and its modifications, which could have similar astrophysical consequences. The non-exhaustive list below includes papers on various aspects of compact objects with naked singularities [4][5][6][7][8][9][10][11][12][13][14], with wormholes [15][16][17][18][19], boson stars [20][21][22][23][24], and the other non-singular objects mimicking the black holes [25][26][27]. The question arises as to how the aforementioned exotic configurations were formed; probably, not all corresponding models can reflect real astrophysical situations.…”

Section: Introductionmentioning

confidence: 99%

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Singularities in static spherically symmetric configurations of General Relativity with strongly nonlinear scalar fields

Stashko¹,

Жданов²

2021

Preprint

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There are a number of publications on relativistic objects dealing either with black holes or naked singularities in the center. Here we show that there exist static spherically symmetric solutions of Einstein equations with a strongly nonlinear scalar field with potential V (ϕ) ∼ sinh(ϕ 2n ), which allow the appearance of singularities of a new type ("spherical singularities") outside the center of isolated configuration. The space-time is assumed to be asymptotically flat. Depending on the configuration parameters, we show that the distribution of the stable circular orbits of test bodies around the configuration is either similar to that in the case of the Schwarzschild solution (thus mimicking an ordinary black hole), or it contains additional rings of unstable orbits.

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Section: Discussionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Singularities in static spherically symmetric configurations of General Relativity with strongly nonlinear scalar fields

Stashko¹,

Жданов²

2021

Preprint

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“…We will also investigate the apparent size of the shadow cast by this wormhole, and compare the results with those of the Schwarzschild black hole. We would like to mention that the shadows of other wormhole spacetimes have been investigated in various papers [53][54][55][56][57][58][59]. Other interesting astrophysical observations regarding wormholes, such as quasi-periodic oscillations, have also been investigated [60][61][62].…”

Section: Photon Sphere Shadow and Iscomentioning

confidence: 99%

Traversable Wormhole in Einstein 3-Form Theory With Self-Interacting Potential

Bouhmadi-López,

Chen,

Chew

et al. 2021

Preprint

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We numerically construct a symmetric wormhole solution in pure Einstein gravity supported by a massive 3-form field with a potential that contains a quartic self-interaction term. The wormhole spacetimes have only a single throat and they are everywhere regular and asymptotically flat. Furthermore, their mass and throat circumference increase almost linearly as the coefficient of the quartic self-interaction term Λ increases. The amount of violation of the null energy condition (NEC) is proportional to the magnitude of 3-form, thus the NEC is less violated as Λ increases, since the magnitude of 3-form decreases with Λ. In addition, we investigate the geodesics of particles moving around the wormhole. The unstable photon orbit is located at the throat. We also find that the wormhole can cast a shadow whose apparent size is smaller than that cast by the Schwarzschild black hole, but reduces to it when Λ acquires a large value. The behavior of the innermost stable circular orbit around this wormhole is also discussed. The results of this paper hint toward the possibility that the 3-form wormholes could be potential black hole mimickers, as long as Λ is sufficiently large, precisely when NEC is weakly violated.

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“…In the literature the effects of different fields like magnetic field and quintessence field, a potential candidate for the dark energy which is assumed to be responsible for the current accelerated expansion of our Universe, have been analysed on the motion of particles in the spacetimes of different BHs [11][12][13][14][15][16][17]. Circular geodesics in spacetimes of BHs in theories of gravity, other than GTR, have also been investigated in the literature, see e.g, [14,[18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Dynamics and Fundamental Frequencies of Test Particles Orbiting Kerr-Newman-NUT-Kiselev Blacks Hole in Rastall Gravity

Narzilloev,

Hussain,

Abdujabbarov

et al. 2021

Preprint

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The spacetime properties in the exterior of the Kerr-Newman-NUT-Kiselev black hole in the Rastall theory of gravity, through particle dynamics are investigated with the aim to find possible degeneracy of the different black hole parameters. We show that the effective potential, the energy, and the angular momentum of a test particle moving in the spacetime of such a black hole strongly depend on the central black hole parameters. We also evaluate the innermost stable circular orbit radii of test particles and show how the spacetime parameters can act on them. Further, we show the results for the fundamental frequencies of test particles moving at small distances from the circular orbits in the equatorial plane. We demonstrate that change in the Rastall parameter κλ, can make the radial epicyclic frequency to become zero at larger distances from the central source. We also notice that for the vertical epicyclic frequencies, in the case of the Kerr-Newman-NUT-Kiselev black hole in the Rastall theory of gravity lower frequencies are observed as compared to the frequencies observed in the case of the Kerr black hole. Finally, we show that for the Kerr-Newman-NUT-Kiselev black hole in the Rastall gravity, the Keplerian frequencies are almost identical with the frequencies noticed in the case of the Kerr black hole and the difference between the two can only be observed in the regions in a very close vicinity to the central black hole, studied in the present work.

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Particle motion around a static axially symmetric wormhole

Cited by 3 publications

References 58 publications

Singularities in static spherically symmetric configurations of General Relativity with strongly nonlinear scalar fields

Singularities in static spherically symmetric configurations of General Relativity with strongly nonlinear scalar fields

Traversable Wormhole in Einstein 3-Form Theory With Self-Interacting Potential

Dynamics and Fundamental Frequencies of Test Particles Orbiting Kerr-Newman-NUT-Kiselev Blacks Hole in Rastall Gravity

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