Rotating black holes with magnetic fields as accelerators of charged particles

Araújo, Carlos Henrique Coimbra; Anjos, Rita Cassia dos

doi:10.22323/1.329.0005

Cited by 3 publications

(4 citation statements)

References 20 publications

(28 reference statements)

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“…where B represents the magnetic field in natural units (see [28,33]). Figure 1 shows one of the main results for some values of B, 1 , and 2 .…”

Section: Kerr Black Holes As Particle Accelerators?mentioning

confidence: 99%

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Ultra-High-Energy Particles at the Border of Kerr Black Holes Triggered by Magnetocentrifugal Winds

Coimbra-Araújo

Anjos

2022

Galaxies

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The source, origin, and acceleration mechanisms of ultra-high-energy cosmic rays (UHECR) (E>1020 eV, beyond the GZK limit) remain uncertain and unclear. The main explanations are associated with particular mechanisms, such as the Fermi mechanism, in which charged particles could be accelerated by clouds of magnetized gas moving within our Galaxy, or by the magnetic reconnection of field lines at, e.g., the core of high-energy astrophysical sources, where the topology of the magnetic field is rearranged and magnetic energy is converted into kinetic energy. However, the recent observation of extragalactic neutrinos may suggest that the source of UHECRs is likely an extragalactic supermassive black hole. In the present work, we propose that charged particles can be accelerated to ultrahigh energies in marginally bound orbits near extreme rotating black holes and could be triggered by collisions of magnetocentrifugal winds; the accretion disk surrounding the black hole would provide such winds. The ultra-high-energy process is governed by the frame-dragging effects of the black hole spacetime.

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“…where B represents the magnetic field in natural units (see [28,33]). Figure 1 shows one of the main results for some values of B, 1 , and 2 .…”

Section: Kerr Black Holes As Particle Accelerators?mentioning

confidence: 99%

“…Figure 1.Variation of E c.m. for a = 0.998 (near-extremal black hole at the Thorne Limit[34]) for four different values of the angular momentum for neutral-charged particles in the presence of B = 0.015 and B = 0.040 magnetic fields (in natural units, see[28,33]). Before the horizon, the colliding particles are accelerated to infinity.…”

mentioning

confidence: 99%

Ultra-High-Energy Particles at the Border of Kerr Black Holes Triggered by Magnetocentrifugal Winds

Coimbra-Araújo

Anjos

2022

Galaxies

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“…can be produced by particles colliding near the horizon of extremal rotating BHs (a = 1). The literature presents the analyzes of such a possible situation in the vicinity of static BHs [22], rotating BHs [22][23][24], charged BHs [25], weakly magnetized BHs [26][27][28] and also Kerr naked singularities [29,30] (for a more complete list of references about the subject see [31]). Ultra high E c.m.…”

Section: Introductionmentioning

confidence: 99%

Acceleration of charged particles from near-extremal rotating black holes embedded in magnetic fields

Coimbra-Araújo

Anjos

2020

Class. Quantum Grav.

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The aim of the present article is to evaluate the motion of neutral and charged test particles in the vicinity of a near-extremal rotating black hole (BH) in the presence of magnetic fields. Euler–Lagrange motion equations and effective potential methods are used to characterize the motion out of the equatorial plane. Such approach is of peculiar significance if it is considered, e.g., accretion processes onto rotating BHs. In general, investigations concerning accretion focus mostly on the simplest case of particles moving in the equatorial plane. Here it will be considered that particles initially moving around some particular orbit may be perturbed by a kick along the θ direction, giving rise to other possible orbits. We confirm the possibility that ultra high energy cosmic rays would be produced at the very center of AGNs, for a specific range of magnetic field magnitudes, since it is possible that ultra-high center-of-mass energies can be produced by particles colliding near the horizon of rotating BHs whose angular momentum tends to the Thorne limit.

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“…can be produced by particles colliding near the horizon of extremal rotating black holes (a = 1). The literature presents the analyzes of such a possible situation in the vicinity of static black holes [22], rotating black holes [22][23][24], charged black holes [25], weakly magnetized black holes [26][27][28] and also Kerr naked singularities [29,30] (for a more complete list of references about the subject see [31]). Ultra high E c.m.…”

Section: Introductionmentioning

confidence: 99%

Acceleration of charged particles from near-extremal rotating black holes embedded in magnetic fields

Coimbra-Araújo,

Anjos

2020

Preprint

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The aim of the present article is to evaluate the motion of neutral and charged test particles in the vicinity of a near-extremal rotating black hole in the presence of magnetic fields. Euler-Lagrange motion equations and effective potential methods are used to characterize the motion out of the equatorial plane. Such approach is of peculiar significance if it is considered, e.g., accretion processes onto rotating black holes. In general, investigations concerning accretion focus mostly on the simplest case of particles moving in the equatorial plane. Here it will be considered that particles initially moving around some particular orbit may be perturbed by a kick along the θ direction, giving rise to other possible orbits. We confirm the possibility that ultra high energy cosmic rays would be produced at the very center of AGNs, for a specific range of magnetic field magnitudes, since it is possible that ultra-high center-of-mass energies can be produced by particles colliding near the horizon of rotating black holes whose angular momentum tends to the Thorne limit.

show abstract

Rotating black holes with magnetic fields as accelerators of charged particles

Cited by 3 publications

References 20 publications

Ultra-High-Energy Particles at the Border of Kerr Black Holes Triggered by Magnetocentrifugal Winds

Ultra-High-Energy Particles at the Border of Kerr Black Holes Triggered by Magnetocentrifugal Winds

Acceleration of charged particles from near-extremal rotating black holes embedded in magnetic fields

Acceleration of charged particles from near-extremal rotating black holes embedded in magnetic fields

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