Constraints on the magnetized Ernst black hole spacetime through quasiperiodic oscillations

Shaymatov, Sanjar; Jamil, Mubasher; Jusufi, Kimet; Bamba, Kazuharu

doi:10.1140/epjc/s10052-022-10560-1

Cited by 22 publications

(6 citation statements)

References 109 publications

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“…If the value of B increases from 0 to M −1 and more, the ISCO radius decreases from 6M to 2M and then disappears behind the horizon. For weak magnetic field, i.e., B << M −1 , the ISCO occurs close to 6M but the exact value is lower than 6M [20]. Now, in this respect, we recall that the parameter r B in our spacetime metric is roughly the extent of the region over which the magnetic field a uniform.…”

Section: B Innermost Stable Circular Orbit In the Ems Black Holementioning

confidence: 92%

Gravitational Larmor precession

Chakraborty¹,

Majumdar²

2022

Preprint

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We model the reported existence of substantive magnetic fields in the vicinity of the central supermassive black holes in Sagitarius A* and Messier 87*, in terms of an axisymmetric, non-rotating Ernst-Melvin-Schwarzschild black hole spacetime with appropriate parameters. We compute the geodesic nodal-plane precession frequency for a test particle with mass, for such a spacetime, and obtain a non-vanishing result, surpassing earlier folklore that only axisymmetric spacetimes with rotation (non-vanishing Kerr parameter) can generate such a precession. We call this magnetic fieldgenerated phenomenon Gravitational Larmor Precession. We discuss observational prospects of this precession in terms of available magnetic field strengths close to central black holes in galaxies.

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Section: B Innermost Stable Circular Orbit In the Ems Black Holementioning

confidence: 92%

Gravitational Larmor precession

Chakraborty¹,

Majumdar²

2022

Preprint

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“…We demonstrate how its magnetic field can affect the Hawking radiation. The fourdimensional Ernst metric [64,65] has the following form…”

Section: Hawking Radiation From Magnetised Ernst-like Black Holementioning

confidence: 99%

Tunneling and thermodynamics evolution of the magnetized Ernst-like black hole

Ali,

Akhtar,

Bamba

et al. 2023

Preprint

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We investigate the tunneling phenomenon of particles through the horizon of a magnetized Ernstlike black hole. We employ the modified Lagrangian equation with the extended uncertainty principle for this black hole. We determine a tunneling rate and the related Hawking temperature for this black hole by using the WKB approach in the field equation. In addition, we examine the graph behavior of the Hawking temperature in relation to the black hole event horizon. We explore the stability analysis of this black hole by taking into account the impact of quantum gravity on Hawking temperatures. The temperature for a magnetized Ernst-like black hole rises as the correction parameter is decreased. Moreover, we analyze the thermodynamics quantities such as Hawking temperature, heat capacity and Bekenstein entropy by using the different approach. We obtain the corrected entropy to study the impact of logarithmic corrections on the different thermodynamic quantities. It is shown that these correction terms makes the system stable under thermal fluctuations.

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“…Here, ν r and ν θ are the frequencies of the perturbed circular motion as detected by an observer at spatial infinity, which are related to the local frequencies, Ω r and Ω θ , by ν r = Ω r /(2πu t ) and ν θ = Ω θ /(2πu t ), where u t and u j are the only nonvanishing components of the four-velocity vector of the infalling particle. Expressions similar to Equations (69) and (70) in the presence of a magnetic source were derived in Shaymatov et al (2022).…”

Section: Limits On the Parameters Of Prz Spacetime Via Quasiperiodic ...mentioning

confidence: 99%

On the Parameters of the Spherically Symmetric Parameterized Rezzolla–Zhidenko Spacetime through Solar System Tests, the Orbit of the S2 Star about Sgr A*, and Quasiperiodic Oscillations

Shaymatov,

Ahmedov,

De Laurentis

et al. 2023

ApJ

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In this paper, we find the higher-order expansion parameters α and λ of spherically symmetric parameterized Rezzolla–Zhidenko (PRZ) spacetime by using its functions of the radial coordinate. We subject the parameters of this spacetime to classical tests, including weak gravitational field effects in the solar system, observations of the S2 star that is located in the star cluster close to the Sgr A⋆, and of the frequencies of selected microquasars. Based on this spherically symmetric spacetime, we perform the analytic calculations for solar system effects such as perihelion shift, light deflection, and gravitational time delay to determine limits on the parameters by using observational data. We restrict our attention to the limits on the two higher-order expansion parameters α and λ that survive at the horizon or near the horizon of spherically symmetric metrics. The properties of the expansion of these two small parameters in PRZ parameterization are discussed. We further apply Markov Chain Monte Carlo simulations to analyze and obtain the limits on the expansion parameters by using observations of the phenomena of the S2 star. Finally, we consider the epicyclic motions and derive analytic expressions of the epicyclic frequencies. Applying these expressions to the quasiperiodic oscillations of selected microquasars allows us to set further limits on the parameters of the PRZ spacetime. Our results demonstrate that the higher-order expansion parameters can be given in the range α, λ = (−0.09, 0.09) and of order ∼10−2 as a consequence of three different tests and observations.

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Constraints on the magnetized Ernst black hole spacetime through quasiperiodic oscillations

Cited by 22 publications

References 109 publications

Gravitational Larmor precession

Gravitational Larmor precession

Tunneling and thermodynamics evolution of the magnetized Ernst-like black hole

On the Parameters of the Spherically Symmetric Parameterized Rezzolla–Zhidenko Spacetime through Solar System Tests, the Orbit of the S2 Star about Sgr A*, and Quasiperiodic Oscillations

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