Lyapunov exponents, phase transition and chaos bound in Kerr-Newman AdS spacetime
arXiv:2506.21882 · doi:10.1016/j.nuclphysb.2026.117297
Abstract
In this paper, we investigate Lyapunov exponents associated with chaotic motions of both massless and massive particles in the vicinity of a Kerr-Newman AdS black hole. Our exploration focuses on their correlations with the black hole phase transition and the chaos bound. The results demonstrate that these exponents serve as effective probes of the phase transition, with the chaotic Lyapunov exponent of the massless particle offering a more precise characterization. Further calculations indicate that critical exponents linked to these Lyapunov exponents are uniformly 1/2. Notably, the violation of the chaos bound occurs irrespective of whether a phase transition is taking place. Through comparative analysis, we identify a critical radius, and the violation consistently arises when the black hole's radius is less than this critical radius. Moreover, this violation is observed in the spacetime of the stable small black hole during the phase transition.
arXiv comment16 pages
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