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SUMMARY:An On-Shell Bootstrap Program of Cosmological Correlators
DTSTART;VALUE=DATE-TIME:20260520T020000Z
DTEND;VALUE=DATE-TIME:20260520T024000Z
DTSTAMP;VALUE=DATE-TIME:20260530T133136Z
UID:indico-contribution-2463@indico.itp.ac.cn
DESCRIPTION:Speakers: Zhong-Zhi Xianyu (Tsinghua University)\nWe develop a
  new bootstrap strategy for cosmological correlators at loop level\, which
  we call spectral dispersion. It is based on two conceptual observations t
 hat a correlator can be recovered from its on-shell data\, also known as n
 onlocal signals\, by analyticity up to local counterterms\, and that the o
 n-shell data for a loop process take the form of a discrete sum over quasi
 normal modes. Technically\, our method combines the dS spectral decomposit
 ion with dispersion relations. Using this technique\, we bootstrap new res
 ults in a simple and intuitive form for 3-point and 4-point correlators wi
 th 1-loop massive exchanges of scalar and vector bosons\, either directly 
 or derivatively coupled. Applications of this bootstrap technique to highe
 r spins and higher-loop banana graphs are also straightforward.\n\nhttps:/
 /indico.itp.ac.cn/event/419/contributions/2463/
LOCATION:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2463/
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