Electromagnetic radiation reaction and energy extraction from black holes: The tail term cannot be ignored

Santos, João S.; Cardoso, Vítor; Natário, José

doi:10.1103/physrevd.107.064046

Cited by 9 publications

(12 citation statements)

References 38 publications

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“…In [10,19], it has been shown that under certain values and signs of parameters k and B the radiation reaction force leads to the widening of circular orbits of radiating charged particles, i.e., increasing their orbital radii due to radiation. The authors of [23] claim that such a counterintuitive result occurs due to a flawed ignoring of the tail term in the equations of motion. In particular, it has been pointed out in [23] that the tail term contains the conservative and dissipative parts and that the former is negligible, while the latter is not, despite being of a similar order of magnitude.…”

Section: Orbital Widening Effectmentioning

confidence: 99%

“…The authors of [23] claim that such a counterintuitive result occurs due to a flawed ignoring of the tail term in the equations of motion. In particular, it has been pointed out in [23] that the tail term contains the conservative and dissipative parts and that the former is negligible, while the latter is not, despite being of a similar order of magnitude. Neglection of the dissipative part of the tail term, according to [23], leads to the orbital widening.…”

Section: Orbital Widening Effectmentioning

confidence: 99%

“…In particular, it has been pointed out in [23] that the tail term contains the conservative and dissipative parts and that the former is negligible, while the latter is not, despite being of a similar order of magnitude. Neglection of the dissipative part of the tail term, according to [23], leads to the orbital widening. Below, we demonstrate that the claim of [23] is wrong, as orbital widening can appear even when the tail term is fully considered.…”

Section: Orbital Widening Effectmentioning

confidence: 99%

“…In some recent studies devoted to the charged particle motion in strong magnetic fields around black holes [10,[19][20][21], the tail term was abandoned in the calculations. This approximation, used in [10,19,20,22] has been recently put into doubt in [23], where the authors derive, in the Newtonian approximation, a simple equation…”

Section: Introductionmentioning

confidence: 99%

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On the Role of the Tail Term in Electromagnetic Radiation Reaction

Stuchlík,

Kološ,

Tursunov

et al. 2024

Universe

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In a recent study devoted to the influence of electromagnetic radiation reaction on the motion of radiating charged particles in magnetized black hole spacetimes the authors claim that the tail term cannot be neglected in the complete DeWitt–Brehme equation, putting into doubt the previous papers where such an approximation was used. Here, we demonstrate by using simple dimensional arguments that such a statement is misleading in many astrophysically relevant situations. In the case of relativistic electrons moving around a stellar-mass black hole, the tail term is ignorable if a magnetic field of at least a few Gauss is present.On the other hand, in different situations, the tail term can be relevant, as demonstrated in the case of orbital widening, where it can even amplify the effect.

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Section: Orbital Widening Effectmentioning

confidence: 99%

Section: Orbital Widening Effectmentioning

confidence: 99%

Section: Orbital Widening Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the Role of the Tail Term in Electromagnetic Radiation Reaction

Stuchlík,

Kološ,

Tursunov

et al. 2024

Universe

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“…Moreover, astrophysical black holes are usually embedded in a complex environment of plasma/magnetic fields with the presence of accretion disks. In this context, the mechanism for the electromagnetic extraction of energy has remained uncertain [6,7]. In the case of spiraling black holes for instance, spacetime rotation can generate electromagnetic outflows similar to the classical Faraday disk triggering Blandford-Znajek processes [8].…”

Section: Introductionmentioning

confidence: 99%

Particle dynamics on test papapetrou fields of vacuum spacetimes

Maier

2024

Phys. Scr.

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In this paper we examine the dynamics of test particles subjected to Papapetrou fields which emerge from vacuum spacetimes isometries.Assuming that the background geometry is described by a Kerr metric whose timelike Killing vector satisfies Maxwell equations, we evaluate the electromagnetic fields -- Papapetrou fields -- byfixing a locally non-rotating (LNR) frame of reference. We also evaluate such the electromagnetic fields for a vanishing rotation parameter assuming a timelike frame of referencefor a Schwarzschild background.In order to probe for the effect of the test Papapetrou fields we study the motion of charged particles in a Kerr background.Restricting ourselves to orbits in the equatorial plane with LNR initial conditions we show that there is an explicit deviation between orbits of neutral and charged particles in the case of repulsive electromagnetic configurations. For critical charge-mass ratios $\zeta_*$ test particles can be found in the Kerr retrograde photon sphere.For static configurations we show that massive/charged test particles may populate the unstable Schwarzschild photon sphere for given domain of the parameter space.

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