报告题目：Thermal correlator at null infinity

报告人：龙江 副教授（华中科技大学）

报告时间：2024年3月27日（周四）下午15:30 - 16:30

报告地点：北洋园校区49教410室

报告摘要：

We study the thermal Carrollian correlators at null infinity in the real-time formalism. We derive the Feynman rules to calculate these correlators in the position space. We compute the bulk-to-bulk, bulk-to-boundary and boundary-to-boundary propagators for massless scalar theory. Due to the doubling of the fields degrees of freedom, the number of each propagator is quadrupled. The bulk-to-boundary propagators have the form of (extended) Bose-Einstein distribution in the position space. Utilizing the contour integral of the propagators, we can transform the Feynman rules to momentum space. Interestingly, the external lines and the amplitude in the momentum space depend on the contour while Carrollian correlators in the position space are independent of the contour. We show how to compute four point correlators at finite temperature. The tree level correlators can be written as the summation of Barnes zeta functions and reduce to the ones in the zero temperature limit.

报告人简介：

Dr. Jiang Long is currently an Associate Professor of Physics at Huazhong University of Science and Technology (HUST). He earned his Ph.D. in Physics from Peking University in 2015. Subsequently, he pursued postdoctoral studies at the Université libre de Bruxelles (ULB). Prior to his appointment at HUST, he held a postdoctoral research position at the Asia-Pacific Center for Theoretical Physics (APCTP). His current research focuses on flat holography and gravitational physics.