题 目：Reduction for one-loop tensor Feynman integrals in the relativistic quantum field theories at finite temperature and/or finite density
报告人：张浩然 （四川师范大学，副教授）
时 间：2024年5月28号（星期二） 15:00
地 点：理科楼 LE201
邀请人：秦思学
报告摘要：The conventional Passarino-Veltman reduction is a systematic procedure based on Lorentz covariance, which can efficiently reduce the one-loop tensor Feynman integrals in the relativistic quantum field theories (QFTs) at zero temperature and zero density. However, the Lorentz covariance is explicitly broken at finite temperature and/or finite density, due to a rest reference frame of the many-body system in which the temperature and density are measured, rendering the conventional Passarino-Veltman reduction not applicable any more to reduce the one-loop tensor Feynman integrals therein. In this talk, I will report a generalized Passarino-Veltman reduction, which can efficiently simplify the one-loop tensor Feynman integrals in the relativistic QFTs at finite temperature and/or finite density. The generalized Passarino-Veltman reduction can applied to the theoretical calculation of one-loop Feynman diagram in a series of physical systems, such as quark-gluon plasma in nuclear physics.
张浩然，四川师范大学物理系副教授。他于2012年在中国科学技术大学理论物理专业获博士学位，随即加入四川师范大学物理系，2017年-2018年在加拿大McGill大学物理系做访问教授。他的研究兴趣集中在拓扑材料中的集体激发、光电响应、磁性相互作用等凝聚态物理问题和Higgs衰变、单圈费曼图约化方法等粒子物理/量子场论问题。