The bound state of a single NS5-brane wrapped on T4 and N NS1-branes has two dual descriptions: its low energy dynamics is described by the symmetric orbifold of T4, while the near horizon geometry is captured by string theory on AdS3×S3×T4 with one unit of NS flux. The latter theory is exactly solvable in the hybrid formalism, and this allows one to prove the equivalence of the two descriptions. In this talk, I will discuss an extension of this duality to Zk orbifolds of the AdS3×S3 background, motivated by the study of black hole microstates. We show that the corresponding worldsheet spectrum reproduces exactly the perturbative excitations on top of a certain non-perturbative state in the dual symmetric orbifold theory. I will further explain how this correspondence extends beyond the spectrum to correlators, at least to leading order in 1/N.

Biography

郭斌，中南大学特聘副教授。博士毕业于俄亥俄州立大学，随后在巴黎萨克雷大学和苏黎世联邦理工学院从事博士后研究。主要研究方向为黑洞微观态及相关问题。

Inviter: Jie-Qiang Wu