Maier, Georg and Schaefer, Andreas and Waeber, Sebastian (2022) Holographic Kolmogorov-Sinai entropy and the quantum Lyapunov spectrum. JOURNAL OF HIGH ENERGY PHYSICS (1): 165. ISSN 1029-8479,
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In classical chaotic systems the entropy, averaged over initial phase space distributions, follows a universal behavior. While approaching thermal equilibrium it passes through a stage where it grows linearly, while the growth rate, the Kolmogorov-Sinai entropy (rate), is given by the sum over all positive Lyapunov exponents. A natural question is whether a similar relation is valid for quantum systems. We argue that the MaldacenaShenker-Stanford bound on quantum Lyapunov exponents implies that the upper bound on the growth rate of the entropy, averaged over states in Hilbert space that evolve towards a thermal state with temperature T, should be given by pi T times the thermal state's von Neumann entropy. Strongly coupled, large N theories with black hole duals should saturate the bound. To test this we study a large number of isotropization processes of random, spatially homogeneous, far from equilibrium initial states in large N, N = 4 Super Yang Mills theory at strong coupling and compute the ensemble averaged growth rate of the dual black hole's apparent horizon area. We find both an analogous behavior as in classical chaotic systems and numerical evidence that the conjectured bound on averaged entropy growth is saturated granted that the Lyapunov exponents are degenerate and given by lambda(i) = +/- 2 pi T. This fits to the behavior of classical systems with plus/minus symmetric Lyapunov spectra, a symmetry which implies the validity of Liouville's theorem.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GRAVITATIONAL WAVES; Black Holes; AdS-CFT Correspondence; Gauge-Gravity Correspondence; Holography and quark-gluon plasmas |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Jan 2024 12:04 |
| Last Modified: | 29 Jan 2024 12:43 |
| URI: | https://pred.uni-regensburg.de/id/eprint/57155 |
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