A bound of chaos


Shenker, S. (2015). A bound of chaos. Perimeter Institute. https://pirsa.org/15050022


Shenker, Stephen. A bound of chaos. Perimeter Institute, May. 19, 2015, https://pirsa.org/15050022


          @misc{ pirsa_15050022,
            doi = {10.48660/15050022},
            url = {https://pirsa.org/15050022},
            author = {Shenker, Stephen},
            keywords = {Quantum Fields and Strings},
            language = {en},
            title = {A bound of chaos},
            publisher = {Perimeter Institute},
            year = {2015},
            month = {may},
            note = {PIRSA:15050022 see, \url{https://pirsa.org}}

Stephen Shenker Stanford University


Based on results in quantum gravity we conjecture a sharp bound on the rate of growth of chaos in thermal quantum systems with a large number of degrees of freedom. Chaos can be diagnosed using an out-of-time-order correlation function closely related to the commutator of operators separated in time. We conjecture that the influence of chaos on this correlator can develop no faster than exponentially, with Lyapunov exponent λL ≤ 2πkBT/\hbar. We give a precise mathematical argument, based on plausible physical assumptions, establishing this conjecture.