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SUMMARY:On Massive Cosmological Correlators
DTSTART:20261118T100000Z
DTEND:20261118T120000Z
DTSTAMP:20261021T084300Z
UID:indico-event-1902@indico.hiskp.uni-bonn.de
DESCRIPTION:Speakers: Denis Werth (MPP Munich)\n\nCosmological correlators
  are the de Sitter counterparts of scattering amplitudes\, yet already at 
 tree level the exchange of massive particles produces multivariate hyperge
 ometric functions rather than rational ones. \nIn this talk\, I will conn
 ect cosmology with Feynman integral techniques\, and argue that this compl
 exity is largely an illusion. I will show that any tree-level massive corr
 elator factorises into universal vertex functions glued together by spectr
 al integrals. These building blocks are conformal integrals in momentum sp
 ace\, close relatives of familiar Feynman integrals: the simplest one is t
 he one-loop massless triangle with generic propagator powers\, which integ
 rates to an Appell F4 function. A gluing algorithm based on elementary gra
 ph combinatorics then fixes the full correlator. Along the way\, I will in
 troduce some techniques that may be new to you\, such as the method of bra
 ckets\, which yields series representations for seemingly complicated inte
 grals. \nWhether you like conformal integrals\, cosmological correlators\
 , or graph combinatorics\, I hope there will be plenty on the table for ev
 eryone. \nThis talk is based on [arXiv:2607.18223] and [arXiv:2608.18073]
 . \n\nhttps://indico.hiskp.uni-bonn.de/event/1902/
URL:https://indico.hiskp.uni-bonn.de/event/1902/
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