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SUMMARY:Regge Theory for Gravity Amplitudes
DTSTART:20251203T134500Z
DTEND:20251203T150000Z
DTSTAMP:20260506T093400Z
UID:indico-event-15654@indico.math.cnrs.fr
CONTACT:cecile@ihes.fr
DESCRIPTION:Speakers: Riccardo Gonzo (Queen Mary University)\n\nSéminaire
  Amplitudes et Gravitation sur l'Yvette (IHES/IPhT)\nI will discuss the hi
 gh-energy\, small-angle limit of two-body classical gravitational scatteri
 ng\, focusing on the tower of multi-H diagrams that govern the leading log
 arithmic behavior. First\, I will show that the recently developed SCET fo
 rward-scattering framework for gravity is fully equivalent to the multi-Re
 gge expansion of the classical amplitude\, reproducing exactly the s-chann
 el multi-H diagrams. I will then compute the single-H diagram at two loops
  and the double-H diagrams at four loops\, matching onto the classical eik
 onal phase in the ultrarelativistic limit. Finally\, using dispersion rela
 tions\, we establish a novel link between the high-energy logarithmic term
 s in the real and imaginary parts of the eikonal phase at 5PM order.\n \n
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LOCATION:Amphithéâtre Léon Motchane (IHES)
URL:https://indico.math.cnrs.fr/event/15654/
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