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SUMMARY:Massive Inflationary Amplitudes: Family-Tree Decomposition of Loop
  Integrands
DTSTART;VALUE=DATE-TIME:20260521T091500Z
DTEND;VALUE=DATE-TIME:20260521T093000Z
DTSTAMP;VALUE=DATE-TIME:20260530T132938Z
UID:indico-contribution-2480@indico.itp.ac.cn
DESCRIPTION:Speakers: Yuanzhao Li (Tsinghua University)\nCosmological corr
 elators with massive loop exchanges appear frequently in cosmological coll
 ider model building as promising sources of oscillatory signals. However\,
  their computations remain challenging. In this work\, we apply the family
 -tree decomposition to correlators at loop level and derive rules to direc
 tly write down analytic answers for arbitrary massive loop integrands in t
 erms of dressed family-tree functions. We also derive a complete set of di
 fferential equations satisfied by arbitrary loop integrands. Finally\, we 
 demonstrate how to perform loop momentum integrals and extract the complet
 e nonlocal cosmological collider signals for a few examples\, among which 
 the results for 1-loop triangle graph and multiloop melon graph are new.\n
 \nhttps://indico.itp.ac.cn/event/419/contributions/2480/
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/2480/
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