We propose a new action for entanglement entropy in the framework of the AdS3/CFT2 correspondence. This action is constructed directly from the entanglement entropy of the CFT2, and we show that the Einstein equations of AdS3 gravity can be derived from it. In the near-coincidence limit, using Riemann normal coordinates, the action reduces to a string worldsheet action in a curved background that naturally includes the symmetric spacetime metric, an antisymmetric Kalb-Ramond field, and a dilaton. The Kalb-Ramond field gives rise to a string charge density, from which we demonstrate that bit threads can be exactly reproduced. This correspondence provides a clear physical interpretation of bit threads. Exploiting this correspondence, we establish explicit relations between the emergent string worldsheet and the Ryu-Takayanagi (RT) surface, providing new insights into entanglement entropy. In particular, entanglement entropy can be computed from open string charge, while Bekenstein-Hawking entropy arises from closed string charge through open-closed string duality. These results suggest a unified picture in which the Susskind-Uglum conjecture, open-closed string duality, and the ER=EPR proposal emerge as equivalent manifestations of the same underlying principle. Finally, we propose a quantization of the RT surface, pointing to a possible connection with loop quantum gravity that refines Wall's conjecture.

Biography

伍厚文，四川大学物理学院副研究员。2018年博士毕业于四川大学物理学院，2018年-2019年在四川大学物理学院从事博士后研究工作，2019年起任副研究员。此外于2016年-2017年在美国哈佛大学物理系担任Visiting Fellow，于2021年-2023年在英国剑桥大学应用数学及理论物理学系从事博士后研究。主要研究方向为弦理论的O(d,d)对称性，全息纠缠熵及弦场论。 

Inviter: Jie-Qiang Wu