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SUMMARY:Novel Properties of QFTs with Long-Range Interactions
DTSTART:20260610T124500Z
DTEND:20260610T140000Z
DTSTAMP:20260614T000200Z
UID:indico-event-16761@indico.math.cnrs.fr
CONTACT:cecile@ihes.fr
DESCRIPTION:Speakers: Luke Lippstreu (University of Edinburgh)\n\nSéminai
 re Amplitudes et Gravitation sur l'Yvette (IHES/IPhT)\nInfrared divergence
 s obscure key analytic properties of scattering amplitudes\, exposing gaps
  in our understanding of unitarity\, causality\, and crossing symmetry in 
 theories with long-range forces. In this talk\, I will use a simple model 
 to illustrate novel analytic features of long-range theories\, including m
 odifications to the connectedness structure of amplitudes and to the gener
 al optical theorem. Since the LSZ reduction formula does not apply to theo
 ries with long-range forces\, I will also present a modified version of LS
 Z reduction for this model\, which accounts for long-range interactions an
 d yields IR-finite amplitudes without ambiguous scales or ill-defined inte
 grals. \n \nPour être informé des prochains séminaires vous pouvez vou
 s abonner à la liste de diffusion en écrivant un mail à sympa@listes.ma
 th.cnrs.fr avec comme sujet: "subscribe seminaire_physique PRENOM NOM"(ind
 iquez vos propres prénom et nom) et laissez le corps du message vide.\n\n
 https://indico.math.cnrs.fr/event/16761/
LOCATION:Amphithéâtre Léon Motchane (IHES)
URL:https://indico.math.cnrs.fr/event/16761/
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