报告题目：Holographic Applications on Quark Stars and Black Holes

报  告 人：张弘 副教授，上海大学

研究方向：基础引力理论

报告时间：2025年6月4日（星期三）下午16:00

报告地点：量子楼410报告厅

报告摘要：

Applying the holographic 2-flavor Einstein-Maxwell-dilaton model, the parameters of which fixed by lattice QCD, we extract the equations of state for hot quark-gluon plasma around the critical point at T=182 MeV, and have corresponding quark star cores constructed. By further adding hadron shells, the mass range of the whole stars spans from 2 to 17 solar masses, with the maximum compactness around 0.15. This result allows them to be black hole mimickers and candidates for gap events. The I-Love-Q-C relations are also analyzed, which show consistency with the neutron star cases when the discontinuity at the quark-hadron interface is not large. Besides, we illustrate the full parameter maps of the energy density and pressure as functions of the temperature and chemical potential, and discuss the constant thermal conductivity case supposing a heat source inside.

We unify the dynamics of massive vector (Proca) fields in Schwarzschild spacetime with supersymmetric gauge theories through the Seiberg-Witten/quasinormal mode (SW/QNM) duality. By mapping Proca perturbations—specifically monopole and odd-parity modes governed by confluent Heun equations—to the quantum Seiberg-Witten curve, we establish a gauge-gravity correspondence. Leveraging instanton counting, we analytically compute QNM and quasi-bound state frequencies to high precision, resolving spectral properties non-perturbatively. Our results align with numerical benchmarks while extending the SW framework beyond scalar fields.

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。