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Particle motions around regular black holes

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arxiv 2301.10465 v3 pith:XPWBQY2K submitted 2023-01-25 gr-qc hep-th

Particle motions around regular black holes

classification gr-qc hep-th
keywords blackcircularparticlesaroundholesmassiveorbitsphotons
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate the bound orbits of massive/massless, neutral particles and photons moving around regular black holes of Fan and Wang. For massive particles, we show the existence of stable/unstable circular orbits and the charge dependence of the radius of the innermost stable circular orbit. Remarkably, we find an unstable circular orbit of photons inside the event horizon. For massless particles and photons, we show that both stable and unstable circular orbits can exist in a regular and horizonless spacetime with a slight overcharge. Then, we also discuss the periapsis shift of massive neutral particles orbiting around the black hole, and show that the charge gives a negative correction to the shift for black holes with small nonlinearity of electrodynamics.

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Cited by 1 Pith paper

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  1. The Remnant of an Evaporating Rotating Regular Black Hole from the Generalized Entropy in the Final Stage of Evaporation

    hep-th 2026-07 conditional novelty 5.0

    A rotating regular black hole leaves a remnant because the correction term in the generalized entropy of Hawking radiation vanishes at a finite mass above the extremal limit.