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SUMMARY:Massive inflationary amplitudes: new representations and degenerat
 e limits
DTSTART;VALUE=DATE-TIME:20260521T093000Z
DTEND;VALUE=DATE-TIME:20260521T094500Z
DTSTAMP;VALUE=DATE-TIME:20260530T133250Z
UID:indico-contribution-2481@indico.itp.ac.cn
DESCRIPTION:Speakers: Jiaju Zang (Tsinghua University)\nThe particle model
  building of cosmological collider physics often involves boost-breaking b
 ilinear mixing between a heavy particle and the nearly massless inflaton m
 ode. In cosmological correlators\, such a mixing is obtained by taking a f
 olded limit of a generic tree graph\, which is a special case of degenerat
 e kinematics. In this work\, we continue our exploration of massive inflat
 ionary amplitudes with a focus on degenerate kinematics. With a suitable c
 hange of variables\, we derive new differential equations and full analyti
 cal solutions for generic tree graphs\, making it trivial to take the fold
 ed limit and partial-energy limit at a vertex. Our result shows that folde
 d tree graphs generally involve functions of smaller transcendental weight
 s than their nondegenerate counterparts. In particular\, the inflaton bisp
 ectrum with triple massive exchanges can be expressed in terms of a trivar
 iate Kampé de Fériet function and simpler hypergeometric functions.\n\nh
 ttps://indico.itp.ac.cn/event/419/contributions/2481/
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/2481/
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