Epicyclic Oscillations around Simpson–Visser Regular Black Holes and Wormholes

Stuchlík, Zdeněk; Vrba, Jaroslav

doi:10.3390/universe7080279

Cited by 41 publications

(30 citation statements)

References 51 publications

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“…( 12) reaches its extreme value at θ = π/2 which can be found by solution of the condition ∂ θ V eff = 0. Now, we consider small perturbations of the orbital motion of the particles in radial r → r 0 + δr and vertical (latitudinal) θ → π/2 + δθ directions, where r 0 is a radial coordinate in where the effective potential takes its extreme value [33].…”

Section: Harmonic Oscillationsmentioning

confidence: 99%

Quasiperiodic Oscillations, Quasinormal Modes and Shadows of Bardeen-Kiselev Black Holes

Rayimbaev,

Majeed,

Jamil

et al. 2022

Preprint

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In this article, we study the particle dynamics around a static and spherically symmetric Bardeen-Kiselev black hole (BK BH) which is a solution of the Einstein-non-linear Maxwell field equations along with a quintessential field. We discuss its essential geometrical properties such as scalar invariants and size of innermost stable circular orbits. Dynamics of test particles around the BH is also studied. Moreover, we also computed the fundamental frequencies of a test particle orbiting the BH in a slightly perturbed orbit. Further, the degeneracy relations between the spin of rotating Kerr BH and magnetic charge of the BK BH at the values of the quintessential parameter ω q = −1/3 and in terms of the same values of innermost stable circular orbits (ISCOs) radius, energy efficiency, twin-peaks quasiperiodic oscillations (QPOs) frequencies and impact parameter for photon are also discussed in detail. Finally, we have investigated the relationship between the shadow radius and the real part of the quasinormal mode (QNM) frequency.

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Section: Harmonic Oscillationsmentioning

confidence: 99%

Quasiperiodic Oscillations, Quasinormal Modes and Shadows of Bardeen-Kiselev Black Holes

Rayimbaev,

Majeed,

Jamil

et al. 2022

Preprint

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“…In the numerical calculations, we have assumed for stellar-mass BHs with the value of its mass of 10M . In this figure, we have also provided analysis of the QPO GRS 1915+105 [49,60,78] with upper and lower frequencies ν U = 168 ± 5 and ν L = 113 ± 3 Hzs, respectively, and the total mass M ∼ 10M . Here we are interested in whether MOG can help to explain the appearance of the object.…”

Section: Astrophysical Applicationsmentioning

confidence: 99%

Dynamics of Test Particles and Twin Peaks QPOs around Regular Black Holes in Modified Gravity

et al. 2021

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In this work, we have presented a detailed analysis of the event horizon of regular black holes (BHs) in modified gravity known as MOG, the so-called regular MOG BH. The motion of neutral particles around the BH has also been explored. The test particle motion study shows that the positive (negative) values of the MOG parameter mimic the spin of a rotating Kerr BH, providing the same values for the innermost stable pro-grade (retrograde) orbits of the particles in the range of the spin parameter a/M∈(−0.4125,0.6946). The efficiency of energy release from the accretion disk by the Novikov–Thorne model has been calculated, and the efficiency was shown to be linearly proportional to the increase of the MOG parameter α. Moreover, we have developed a new methodology to test gravity theories in strong-field regimes using precision data from twin-peaked quasiperiodic oscillations (QPOs) of objects calculating possible values of upper and lower frequencies. However, it is obtained that the positive MOG parameter can not mimic the spin of Kerr BHs in terms of the same QPO frequencies. We have provided possible ranges for upper and lower frequencies of twin-peak QPOs with the ratio of the upper and lower frequencies of 3:2 around regular MOG BHs in the different models. Moreover, as an example, we provide detailed numerical analysis of the QPO of GRS 1915+105 with the frequencies νU=168±5Hz and νL=113±3Hz. It is shown that the central BH of the QPO object can be a regular MOG BH when the value of the parameter is α=0.2844−0.1317+0.0074 and shines in the orbits located at the distance r/M=7.6322−0.0826+0.0768 from the central BH. It is also shown that the orbits where QPOs shine are located near the innermost stable circular orbit (ISCO) of the test particle. The correlation between the radii of ISCO and the QPO orbits is found, and it can be used as a new theoretical way to determine ISCO radius through observational data from the QPOs around various compact objects.

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“…The rotational Kerr-like generalization of the meta-geometry was recently given in [20]. Interesting phenomena were found in studies of the Simpson-Visser meta-geometry for various astrophysical phenomena [47,40].…”

Section: Introductionmentioning

confidence: 98%

“…Of special interest are so called geodesic model of twin high-frequency quasiperiodic oscillations observed in microquasars and active galactic nuclei [2,43,35,39] that seem to be very successful in the case of microquasars [44,31] but seem to be irrelevant for data observed in active galactic nuclei, if we use the standard assumption of central supermassive black holes [29]. Therefore, it is of high interest, if this fault a Email address: zdenek.stuchlik@physics.slu.cz b Email address: jaroslav.vrba@physics.slu.cz of the standard HF QPOs geodesic models could be cured by assumption of a central supermassive wormhole instead of a black hole [40,13,12].…”

Section: Introductionmentioning

confidence: 99%

Epicyclic orbits in the field of Einstein-Dirac-Maxwell traversable wormholes applied to the quasiperiodic oscillations observed in microquasars and active galactic nuclei

Stuchlík¹,

Vrba²

2021

Preprint

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We study the epicyclic oscillatory motion around circular orbits of the traversable asymptotically flat and reflection-symmetric wormholes obtained in the Einstein-Dirac-Maxwell theory without applying exotic matter in their construction. We determine frequencies of the orbital and epicyclic motion in the Keplerian disks having inner edge at the marginally stable circular geodesic of the spacetime. The obtained frequencies are applied in the so called geodesic models of high-frequency quasiperiodic oscillations (HF QPOs) observed in microquasars and active galactic nuclei containing a supermassive central object. We show that even the simplest epicyclic resonance variant of the geodesic models can explain the HF QPOs observed in many active galactic nuclei for realistic choices of the wormhole parameters, but there are some of the sources where only wormholes with unrealistically large values of the parameters can be sufficient for the explanation. On the other hand, in the case of microquasars, the observed HF QPOs strongly restrict the acceptable values of the wormhole parameters.

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Epicyclic Oscillations around Simpson–Visser Regular Black Holes and Wormholes

Cited by 41 publications

References 51 publications

Quasiperiodic Oscillations, Quasinormal Modes and Shadows of Bardeen-Kiselev Black Holes

Quasiperiodic Oscillations, Quasinormal Modes and Shadows of Bardeen-Kiselev Black Holes

Dynamics of Test Particles and Twin Peaks QPOs around Regular Black Holes in Modified Gravity

Epicyclic orbits in the field of Einstein-Dirac-Maxwell traversable wormholes applied to the quasiperiodic oscillations observed in microquasars and active galactic nuclei

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