The distinguishing signature of magnetic Penrose process

Dadhich, Naresh; Tursunov, Arman; Ahmedov, Bobomurat; Stuchlík, Zdeněk

doi:10.1093/mnrasl/sly073

Cited by 102 publications

(81 citation statements)

References 34 publications

(57 reference statements)

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“…This idea was originally suggested by Penrose and Floyed in the late seventies [26], concerning energy extraction from a black hole in the presence of a ergoregion. Since then, many investigations have been carried out in many aspects to examine the implications of Penrose process in various astrophysical domains [46][47][48][49][50][51][52][53][54][55][56].…”

Section: Energy Extraction From Kerr-newman-nut Black Holementioning

confidence: 99%

On some novel features of the Kerr–Newman-NUT spacetime

2019

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In this work we have presented a special class of Kerr-Newman-NUT black hole, having its horizon located precisely at r = 2M , for Q 2 = l 2 − a 2 , where M , l, a and Q are respectively mass, NUT, rotation and electric charge parameters of the black hole. Clearly this choice radically alters the causal structure as there exists no Cauchy horizon indicating spacelike nature of the singularity when it exists. On the other hand, there is no curvature singularity for l 2 > a 2 , however it may have conical singularities. Furthermore there is no upper bound on specific rotation parameter a/M , which could exceed unity without risking destruction of the horizon. To bring out various discerning features of this special member of the Kerr-Newman-NUT family, we study timelike and null geodesics in the equatorial as well as off the equatorial plane, energy extraction through super-radiance and Penrose process, thermodynamical properties and also the quasi-periodic oscillations. It turns out that the black hole under study radiates less energy through the super-radiant modes and Penrose process than the other black holes in this family. * sm13ip029@iiserkol.ac.in

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Section: Energy Extraction From Kerr-newman-nut Black Holementioning

confidence: 99%

On some novel features of the Kerr–Newman-NUT spacetime

2019

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“…After that the properties of the electromagnetic field structure around rotating black holes have been considered by various authors. The role of the magnetic field through magnetic Penrose process has been studied by [50][51][52][53][54][55][56]. The similar scenarios in alternative/modified theories of gravity have been studied in [28,[57][58][59][60][61][62].…”

Section: Introductionmentioning

confidence: 99%

Charged particle motion around a quasi-Kerr compact object immersed in an external magnetic field

et al. 2019

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We explore the electromagnetic fields around a quasi-Kerr compact object assuming it is immersed in an external asymptotically uniform magnetic field. Using the Wald method, components of the electromagnetic field in orthonormal basis have been obtained. We explore the charged particle motion around deformed Kerr compact objects in the presence of external asymptotically uniform magnetic fields. Using the Hamilton-Jacobi equation, we obtain the effective potential expression for the charged particle surrounding a quasi-Kerr compact object immersed in an external magnetic field. It is also derived the dependence of innermost stable circular orbits (ISCOs) from the magnetic and deformation parameters for charged particles motion around a rotating quasi-Kerr compact object. Comparison with ISCO radius measurements has provided the constraint to the deformation parameter as −0.012. The center of mass (CM) energy of the colliding particles in several physically interesting cases has been studied.

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“…True, in moderately high magnetic fild range, the two seem to be similar. Recently, it has been argued [23] that MPP is a general process that works in all magnetic field range while BZ requires the threshold magnetic field, and for that range the former approximates to the latter. That is BZ is contained in MPP in high field range.…”

Section: Discussionmentioning

confidence: 99%

“…In [10], it is shown that, in realistic cases applied to the Galactic center black hole, even a small charge of the black hole can have non-negligible effects on the observed bremsstrahlung emission profile. We would like to emphasize that the black hole charge plays a key role in the black hole energy extraction processes, such as Blandford-Znajek mechanism and magnetic Penrose process [23]. Discharge of induced electric field by oppositely charged accreting matter drives the rotational energy away from the black hole in both of the processes.…”

Section: Black Hole Chargementioning

confidence: 99%

Fifty Years of Energy Extraction from Rotating Black Hole: Revisiting Magnetic Penrose Process

Tursunov

Dadhich

2019

Universe

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Magnetic Penrose process (MPP) is not only the most exciting and fascinating process mining the rotational energy of black hole but it is also the favored astrophysically viable mechanism for high energy sources and phenomena. It operates in three regimes of efficiency, namely low, moderate and ultra, depending on the magnetization and charging of spinning black holes in astrophysical setting. In this paper, we revisit MPP with a comprehensive discussion of its physics in different regimes, and compare its operation with other competing mechanisms. We show that MPP could in principle foot the bill for powering engine of such phenomena as ultra-high-energy cosmic rays, relativistic jets, fast radio bursts, quasars, AGNs, etc. Further, it also leads to a number of important observable predictions. All this beautifully bears out the promise of a new vista of energy powerhouse heralded by Roger Penrose half a century ago through this process, and it has today risen in its magnetically empowered version of mid 1980s from a purely thought experiment of academic interest to a realistic powering mechanism for various high-energy astrophysical phenomena.

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The distinguishing signature of magnetic Penrose process

Cited by 102 publications

References 34 publications

On some novel features of the Kerr–Newman-NUT spacetime

On some novel features of the Kerr–Newman-NUT spacetime

Charged particle motion around a quasi-Kerr compact object immersed in an external magnetic field

Fifty Years of Energy Extraction from Rotating Black Hole: Revisiting Magnetic Penrose Process

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