JHEP 05 (2020) 045

Time evolution of the complexity in chaotic systems: a concrete example

Run-Qiu Yang^a,b and Keun-Young Kim^c

^a Center for Joint Quantum Studies and Department of Physics School of Science, Tianjin University, Yaguan Road 135, Jinnan District, 300350 Tianjin, P.R. China

^b Quantum Universe Center, Korea Institute for Advanced Study, Seoul 130-722, South Korea

^c School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju 61005, South Korea

E-mail:    aqiu@tju.edu.cn     fortoe@gist.ac.kr

Abstract

 We investigate the time evolution of the complexity of the operator by the Sachdev-Ye-Kitaev (SYK) model with N Majorana fermions. We follow Nielsen’s idea of complexity geometry and geodesics thereof. We show that it is possible that the bi- invariant complexity geometry can exhibit the conjectured time evolution of the complexity in chaotic systems: i) linear growth until t ∼ e^N , ii) saturation and small fluctuations after then. We also show that the Lloyd’s bound is realized in this model. Interestingly, these characteristic features appear only if the complexity geometry is the most natural “non-Riemannian” Finsler geometry. This serves as a concrete example showing that the bi-invariant complexity may be a competitive candidate for the complexity in quantum mechanics/field theory (QM/QFT). We provide another argument showing a naturalness of bi-invariant complexity in QM/QFT. That is that the bi-invariance naturally implies the equivalence of the right-invariant complexity and left-invariant complexity, either of which may correspond to the complexity of a given operator. Without bi-invariance, one needs to answer why only right (left) invariant complexity corresponds to the “complexity”, instead of only left (right) invariant complexity.