Abstract

The newly established Seiberg-Witten (SW)/Quasinormal Modes (QNM) correspondence offers an efficient analytical approach to calculate the QNM frequencies, which was only available numerically before. This is based on the fact that both sides are characterized by Heun-type equations. We find that a similar duality exists between Seiberg-Witten theory and black hole superradiance, since the latter can also be linked to confluent Heun equation after proper transformation.

We also study the quasinormal modes (QNM) of the charged C-metric, which physically stands for a charged accelerating black hole, with the help of Nekrasov's partition function of 4d superconformal field theories (SCFTs).

In 2019, a theoretical equation of state for neutron stars with only one parameter is derived from Witten-Sakai-Sugimoto model, as an application of AdS/QCD, where pointlike instanton case is taken into consideration. Now we upgrade this model to instanton gas, with one more variable, the instanton width. This is not naively a free parameter, but a function of the chemical potential.

报告人简介

张弘，本科毕业于清华大学工程物理系，硕士、博士毕业于(日本)东京大学物理系。先后在(日本)中央大学、(韩国)西江大学、中国科学院理论物理研究所及台湾师范大学进行博士后研究工作。2021年3月加入上海大学任副教授。研究围绕基础引力理论：一方面从理论角度，研究作为量子引力理论最有力候补的超弦理论，另一方面从实际出发，利用近年引力波的观测数据来检验修正天体与粒子模型。具体在AGT猜想(规范场论/共形场论对偶)的证明与推广、量子代数与可积性、解释并预测引力波观测事件等一系列前沿问题上进行了开拓。