Localized chaos in rotating and charged AdS black holes

Abstract

The butterfly velocity and the Lyapunov exponent of four-dimensional rotating charged asymptotically AdS black holes are calculated to probe chaos using localized rotating and charged shock waves. The localized shocks also generate butterfly velocities which quickly vanish when we approach extremality, indicating no entanglement spread near extremality. One of the butterfly velocity modes is well bounded by both the speed of light and the Schwarzschild-AdS result, while the other may become superluminal. Aside from the logarithmic behavior of the scrambling time which indicates chaos, the Lyapunov exponent is also positive and bounded by $\kappa=2\pi T_H/(1-\mu\mathcal{L})$. The Kerr-NUT-AdS and Kerr-Sen-AdS solutions are used as examples to attain a better understanding of the chaotic phenomena in rotating black holes, especially the ones with extra conserved charges.Comment: 10 pages, 4 figures. Comments are welcom