BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Renormalons\, Instantons and the failure of perturbation theory DTSTART;VALUE=DATE-TIME:20250109T020000Z DTEND;VALUE=DATE-TIME:20250109T040000Z DTSTAMP;VALUE=DATE-TIME:20250725T221700Z UID:indico-event-24844@indico.ihep.ac.cn DESCRIPTION:Speakers: Schwartz Matthew (Harvard University)\n报告摘要 ：Perturbative expansions in quantum mechanics and quantum field theory a re generally asymptotic: series cannot be summed into a finite answer. Thi s asymptotic growth is typically associated with either "instantons" or "r enormalons' both of which connect perturbation theory to non-perturbative effects. Thus asymptotic series provide one of the most promising paths to wards an analytic understanding of non-perurbative effects in quantum fie ld theory. Unfortunately\, while instantons are fairly well understood\, a s saddle points of the Euclidean action\, renormalons are more elusive. T his talk will connect renormalons and instantons directly\, identifying re normalons as saddle points of the 1-loop effective action\, and provide a novel way to think about both through a suggestive duality between the act ion and the Borel transform. \n\n个人简介：Matthew Schwartz 是哈 佛大学物理系教授。他博士毕业于普林斯顿大学，在加 州大学伯克利分校和约翰普金斯大学从事博士后研究后 ，在2008年加入哈佛大学任助理教授，并于2015年升任正教 授。他的主要研究方向是量子场论和粒子物理，以及高 能物理与人工智能的交叉领域，在喷注物理、量子色动 力学和有效场论方面做出了开创性贡献，曾获得美国能 源部早期职业奖。他是美国国家科学基金人工智能和基 本相互作用研究所的主要负责人之一。他长期担任哈佛 大学久负盛名的量子场论课程教学工作，所著的《量子 场论与标准模型》是现代量子场论教学的标准参考书。\n https://indico.ihep.ac.cn/event/24844/ LOCATION:图书馆楼319会议室 URL:https://indico.ihep.ac.cn/event/24844/ END:VEVENT END:VCALENDAR

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