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SUMMARY:Rethinking Loop Integrands
DTSTART;VALUE=DATE-TIME:20260422T040000Z
DTEND;VALUE=DATE-TIME:20260422T053000Z
DTSTAMP;VALUE=DATE-TIME:20260426T090800Z
UID:indico-event-4897@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Qu Cao（曹趣） (西湖大学)\n\nAbstract:In thi
 s talk\, I will present some recent progress on loop integrands from sever
 al perspectives. At one loop\, we derive a universal expansion for general
  gauge theories through single-cut reconstruction\, leading to closed-form
  expressions in gauge theory\, in particular for Yang–Mills theory. We f
 urther extend the single-cut reconstruction to one-loop gravity integrands
  and derive the corresponding double-copy BCJ and KLT relation at the leve
 l of loop integrands. Similar ideas can be generalized to higher loops\, a
 lthough subtleties arise in Yang–Mills theory. Nevertheless\, we develop
  an algorithm for constructing higher-loop Yang–Mills integrands via sin
 gle-cut recursion. These results suggest that the general philosophy of re
 constructing integrands from cuts applies broadly to color-ordered loop in
 tegrands.Biography:Qu Cao received his Bachelor's degree from Zhejiang Uni
 versity in 2021. He will complete his doctoral studies in Theoretical Phys
 ics at Zhejiang University and the Institute of Theoretical Physics\, Chin
 ese Academy of Sciences\, in 2026\, under the supervision of Ellis Ye Yuan
  and Song He. He has twice received the National Graduate Scholarship and 
 was awarded an National Natural Science Foundation of China  doctoral res
 earch grant during his PhD.  His research focuses on the analytic propert
 ies and underlying mathematical structures of perturbative scattering ampl
 itudes in quantum field theory and string theory.  He will join Westlake 
 University as a Westlake Fellow in the summer of 2026.Host: Prof. Kai YanA
 lternative online link：https://meeting.tencent.com/dm/EJrHFRN8LleiID:307
 142188   Password: 123456\n\nhttps://indico-tdli.sjtu.edu.cn/event/4897/
LOCATION:5#/6th-603 - Meeting Room 603 (Science Building)
URL:https://indico-tdli.sjtu.edu.cn/event/4897/
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