paper

Time evolution of entanglement entropy of moving mirrors influenced by strongly coupled quantum critical fields

arXiv:1904.06831 · doi:10.1007/JHEP06(2019)068

Abstract

The evolution of the Von Neumann entanglement entropy of a -dimensional mirror influenced by the strongly coupled -dimensional quantum critical fields with a dynamic exponent is studied by the holographic approach. The dual description is a -dimensional probe brane moving in the -dimensional asymptotic Lifshitz geometry ended at , which plays a role as the UV energy cutoff. Using the holographic influence functional method, we find that in the linear response region, by introducing a harmonic trap for the mirror, which serves as a IR energy cutoff, the Von Neumann entropy at late times will saturate by a power-law in time for generic values of and . The saturated value and the relaxation rate depend on the parameter , which is restricted to but . We find that the saturated values of the entropy are qualitatively different for the theories with and . Additionally, the power law relaxation follows the rate . This probe brane approach provides an alternative way to study the time evolution of the entanglement entropy in the linear response region that shows the similar power-law relaxation behavior as in the studies of entanglement entropies based on Ryu-Takayanagi conjecture. We also compare our results with quantum Brownian motion in a bath of relativistic free fields.

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