paper

Replica wormhole and information retrieval in the SYK model coupled to Majorana chains

arXiv:2003.13147 · doi:10.1007/JHEP06(2020)121

Abstract

Motivated by recent studies of the information paradox in (1+1)-D anti-de Sitter spacetime with a bath described by a (1+1)-D conformal field theory, we study the dynamics of second Rényi entropy of the Sachdev-Ye-Kitaev (SYK) model () coupled to a Majorana chain bath (). The system is prepared in the thermofield double (TFD) state and then evolved by . For small system-bath coupling, we find that the second Rényi entropy of the SYK model undergoes a first order transition during the evolution. In the sense of holographic duality, the long-time solution corresponds to a "replica wormhole". The transition time corresponds to the Page time of a black hole coupled to a thermal bath. We further study the information scrambling and retrieval by introducing a classical control bit, which controls whether or not we add a perturbation in the SYK system. The mutual information between the bath and the control bit shows a positive jump at the Page time, indicating that the entanglement wedge of the bath includes an island in the holographic bulk.

25 pages, 12 figures

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