General properties of the Penrose process with neutral particles in the equatorial plane

Zaslavskii, O. B.

doi:10.1103/physrevd.108.084022

Cited by 4 publications

(3 citation statements)

References 35 publications

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“…The process of matter accretion around both supermassive and stellar-mass black holes is widely acknowledged as a mechanism for producing high-energy relativistic particles near active galactic nuclei and the low-mass X-ray binary sources associated with stars, respectively. Although the precise mechanisms governing the generation of energy in these highly energetic sources remain to be fully understood, there is a prevalent consensus that underscores the substantial influence of magnetic fields in the surroundings of rotating black holes, playing a crucial role in the creation of high-energy relativistic particles [56][57][58].…”

Section: Intensity Of Electromagnetic Radiation By Accelerated Charge...mentioning

confidence: 99%

Charged Particles Orbiting Charged Black-Bounce Black Holes

Murodov,

Badalov,

Rayimbaev

et al. 2024

Symmetry

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The detailed and comprehensive analysis of radiation processes in accretion disks consisting of electrically charged particles around black holes may provide powerful information about the spacetime geometry of the central black hole. We investigate the circular orbits of electrically charged particles around an electrically charged black-bounce Reissner–Nordström (RN) black hole, known as an RN Simpson–Visser (SV) black hole. We also study the profiles of the innermost stable circular orbits (ISCOs), energy, and angular momentum of the particles in their ISCOs, as well as the efficiency of energy release processes in the accretion disk in the Novikov–Thorne model. Finally, we calculate and study the effects of the black-bounce parameter as well as the black-hole charge on the intensity of the radiation of ultrarelativistic charged particles orbiting the charged RN SV black hole along circular orbits and falling into the black hole. It is observed that the black-bounce parameter essentially decreases the ISCO radius, and consequently the energy extraction and intensity of electromagnetic radiation.

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Section: Intensity Of Electromagnetic Radiation By Accelerated Charge...mentioning

confidence: 99%

Charged Particles Orbiting Charged Black-Bounce Black Holes

Murodov,

Badalov,

Rayimbaev

et al. 2024

Symmetry

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“…The energy extraction from ergosphere of a Kerr black hole (BH) has attracted considerable attention in the current literature (e.g. [1,2], and references therein). This paper provides a quantitative analysis of the feedback from the Penrose process on the irreducible mass, demonstrating the irreversibility of energy extraction and its impact on the total amount of energy that can be extracted from a BH.…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, numerous methods and their corresponding extended research for extracting energy from BHs have been proposed [2,[15][16][17][18][19][20][21][22]. Especially, the challenge of using the Kerr BH as an energy source for astrophysical systems and it affect on irreduceble mass has been addressed in context of test magnetic field around a Kerr BH, with examples in the special cases of GRBs and AGNs [23].…”

Section: Introductionmentioning

confidence: 99%

The transformation of the rotational energy of a Kerr black hole

Zhang,

Prakapenia

2024

Class. Quantum Grav.

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This paper analyzes the feedback of the rotational energy extraction from a Kerr black hole (BH) by the ``ballistic method'', i.e., the test particle decay in the BH ergosphere pioneered by Roger Penrose. The focus is on the negative energy counterrotating particles (which can be massive or massless) going in towards the horizon, and the feedback on the BH irreducible mass is assessed. Generally, the change in irreducible mass is a function of the conserved quantities of the particle. For extreme Kerr BH and in the test particle limit, all the reduced transformable energy goes into the irreducible mass (i.e. $\Delta M_{\rm irr}/|E_1| \to \infty$), resulting in high irreversibility. The amount of extracted energy from a Kerr BH using test particles is much lower than the change of transformable energy. For non-extreme Kerr BHs, the effective potential of particle motion on the equatorial plane in Kerr spacetime is analyzed, and it is demonstrated that the Penrose process can only be undergone by BHs with a dimensionless spin $\hat{a} > 1/\sqrt{2}$ if the decay point coincides with the turning point. Based on that, the lower limit of the change in irreducible mass is provided as a function of the dimensionless spin of the BH. The significance of the increase in the irreducible mass of the BH during the energy extraction process is generally and concisely illustrated by introducing the concept of transformable energy of the BH. The feedback from the Penrose process on the irreducible mass demonstrates the irreversibility of energy extraction and highlights that the total amount of energy that can be extracted from a BH is less than previously anticipated.

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