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Replica wormhole and information retrieval in the SYK model coupled to Majorana chains by Chen, Yiming; Qi, Xiao-Liang; Zhang, Pengfei is a scholarly article available to read on EtoBox.

What is Replica wormhole and information retrieval in the SYK model coupled to Majorana chains about?

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 R\'{e}nyi entropy of the Sachdev-Ye-Kitaev (SYK) model ($\chi$) coupled to a Majorana chain bath ($\psi$). The system is prepared in the thermofield double (TFD) state and then evolved by $H_L+H_R$. For small system-bath coupling, we find that the second R\'{e}nyi entropy $S^{(2)}_{\chi_L, \chi_R}$ 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.

Author

Chen, Yiming; Qi, Xiao-Liang; Zhang, Pengfei

Published

2020

Language

EN