Extraction of energy from an extremal rotating electrovacuum black hole: Particle collisions along the axis of symmetry

Hejda, Filip; Bičák, Jiřı́; Заславский, О. Б.

doi:10.1103/physrevd.100.064041

Cited by 11 publications

(3 citation statements)

References 78 publications

(254 reference statements)

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“…In [67][68][69][70][71], authors have studied the Super-Penrose process with charged particles near-naked singularity, white holes and wormholes. Researchers have also studied energy extraction in different scenarios like extremal rotating electrovacuum black holes using particle collision [72][73][74][75][76][77][78], and the Penrose process in axially symmetric magnetized black holes [79].…”

Section: Introductionmentioning

confidence: 99%

Rotational energy extraction from the Kerr black hole's mimickers

Patel¹,

Acharya²,

Bambhaniya³

et al. 2022

Preprint

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In this paper, the Penrose process is being used to extract rotational energy from regular black holes. Initially, we consider the rotating Simpson-Visser regular spacetime which describes the class of geometries of the Kerr black hole's mimickers. The Penrose process is then studied through conformally transformed rotating singular and regular black hole solutions. These both Simpson-Visser and conformally transformed geometries depend on mass, spin, and an additional regularisation parameter l. In both cases, we investigate how the spin and regularisation parameter l affects the configuration of an ergoregion and event horizons. Surprisingly, we find that the energy extraction efficiency from the event horizon surface is not dependent on the regularisation parameter l in the Simpson-Visser regular spacetimes and hence it does not vary from the Kerr black hole case. While, in the conformally transformed singular and regular black holes, we obtain the efficiency rate of extracted energies are extremely high compared to the Kerr black hole scenario. This distinct signature of the conformally transformed singular and regular black holes would be useful to distinguish them from the Kerr black hole in observation.

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Section: Introductionmentioning

confidence: 99%

Rotational energy extraction from the Kerr black hole's mimickers

Patel¹,

Acharya²,

Bambhaniya³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Authors have studied the super-Penrose process with charged particles with near-naked singularities, white holes, and wormholes. Researchers have also studied energy extraction in different scenarios such as extremal rotating electrovacuum black holes using particle collision [73][74][75][76][77][78][79] and the Penrose process in axially symmetric magnetized black holes [80].…”

Section: Introductionmentioning

confidence: 99%

Rotational Energy Extraction from the Kerr Black Hole’s Mimickers

et al. 2022

View full text Add to dashboard Cite

In this paper, the Penrose process is used to extract rotational energy from regular black holes. Initially, we consider the rotating Simpson–Visser regular spacetime, which describes the class of geometries of Kerr black hole mimickers. The Penrose process is then studied through conformally transformed rotating singular and regular black hole solutions. Both the Simpson–Visser and conformally transformed geometries depend on mass, spin, and an additional regularisation parameter l. In both cases, we investigate how the spin and regularisation parameter l affect the configuration of an ergoregion and event horizons. Surprisingly, we find that the energy extraction efficiency from the event horizon surface is not dependent on the regularisation parameter l in the Simpson–Visser regular spacetimes, and hence, it does not vary from that of the Kerr black hole. Meanwhile, in conformally transformed singular and regular black holes, we obtain that the efficiency rate of extracted energies is extremely high compared to that of the Kerr black hole. This distinct signature of conformally transformed singular and regular black holes is useful to distinguish them from Kerr black holes in observation.

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“…The other interesting theoretical outcome of ultrahigh-energy collisions was the concept that extreme or near-to-extreme Kerr black holes may be regarded as particle accelerators. Consequently, a variety of extreme Kerr-like BHs have been considered (see, e.g., [8][9][10]). Yet, Schwarzschild BHs have been regarded as less interesting due to their well-defined energy collision limit, γ = 2 √ 5 m 0 (see, e.g., [2,6]).…”

Section: Introductionmentioning

confidence: 99%

Unbounded Energy Collisions inside and outside Black Holes

et al. 2022

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The possibility of on-horizon collisions of unbounded energy in the case of an extreme Kerr black hole is known as the BSW effect. It is also a widely accepted point of view that the energy collision of two identical particles of mass m near the horizon of a Schwarzschild black hole is limited to a value of 25 m. We show that there are two possible scenarios for unbounded energy collisions both for the exterior and for the interior of spherically symmetric black holes. Similar scenarios are found for axially symmetric black holes. It is shown that divergent (infinite) energy on-(inner)horizon collisions are excluded due to the anisotropic character of the dynamics of black hole interiors.

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Extraction of energy from an extremal rotating electrovacuum black hole: Particle collisions along the axis of symmetry

Cited by 11 publications

References 78 publications

Rotational energy extraction from the Kerr black hole's mimickers

Rotational energy extraction from the Kerr black hole's mimickers

Rotational Energy Extraction from the Kerr Black Hole’s Mimickers

Unbounded Energy Collisions inside and outside Black Holes

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