BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Loops and marginal deformation in celestial holography DTSTART;VALUE=DATE-TIME:20231031T053000Z DTEND;VALUE=DATE-TIME:20231031T073000Z DTSTAMP;VALUE=DATE-TIME:20250827T090400Z UID:indico-event-20886@indico.ihep.ac.cn DESCRIPTION:Speakers: 毛普健 (天津大学)\n报告摘要：Four-dimens ional all-loop amplitudes in QED and gravity exhibit universal Infrared (I R) singularities with a factorization structure. This structure is governe d by tree amplitudes and a universal IR-divergent factor representing the exchange of soft particles between external lines. In this talk\, I will p resent a precise dual interpretation of these universal IR-divergent facto rs within celestial holography. Considering the tree amplitude as the foun dation of the celestial conformal field theory (CCFT)\, these universal fa ctors correspond to marginal deformations in the CCFT. Our findings establ ish a concrete dictionary for celestial holography and offer a holographic lens to understand loop corrections in scattering amplitudes.\n\n报告 人简介：Dr. Pujian Mao is an associate professor in Tianjin University . He obtained his PhD from Free University of Brussels in 2016. After two years postdoctoral research at IHEP\, he joined Tianjin University in 2018 . His research interests mainly focus on applications of asymptotic symmet ry in gauge and gravity theory.\nhttps://indico.ihep.ac.cn/event/20886/ URL:https://indico.ihep.ac.cn/event/20886/ END:VEVENT END:VCALENDAR