Bound on the Lyapunov exponent in Kerr-Newman black holes via a charged particle
arXiv:2109.07341 · doi:10.1103/PhysRevD.105.026006
Abstract
We investigate the conjecture on the upper bound of the Lyapunov exponent for the chaotic motion of a charged particle around a Kerr-Newman black hole. The Lyapunov exponent is closely associated with the maximum of the effective potential with respect to the particle. We show that when the angular momenta of the black hole and particle are considered, the Lyapunov exponent can exceed the conjectured upper bound. This is because the angular momenta change the effective potential and increase the magnitude of the chaotic behavior of the particle. Furthermore, the location of the maximum is also related to the value of the Lyapunov exponent and the extremal and non-extremal states of the black hole.
arXiv comment25 pages, 6 figures, published in PRD
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