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SUMMARY:Infrared-safe positivity bounds with long-range interactions
DTSTART:20261027T130000Z
DTEND:20261027T140000Z
DTSTAMP:20261112T183400Z
UID:indico-event-1745641@indico.cern.ch
DESCRIPTION:Speakers: Marcello Romano (EPFL)\n\nLong-range interactions ma
 ke generic observables sensitive to the infrared structure of the theory. 
 For instance photons and/or gravitons force exclusive S-matrix elements to
  vanish in D=4 flat space-time\, due to infrared divergences. This poses a
  challenge to programs\, such as positivity and S-matrix bootstrap\, that 
 directly rely on the properties of 2-to-2 amplitudes. In this talk\, I wil
 l introduce stripped amplitudes as IR-safe\, analytic\, crossing-symmetric
 \, and Regge-behaved avatars of standard amplitudes\, associated with a ph
 ysical detector scale \\E. In the regime in which the latter is taken expo
 nentially small than all other scales\, they also satisfy a form of unitar
 ity\, allowing to derive IR-safe positivity bounds on EFTs\, in presence o
 f long-range interactions.\n\nhttps://indico.cern.ch/event/1745641/\n\nZoo
 m: https://cern.zoom.us/j/61053603623?pwd=THhlNnU4ZXljQjFxMjVwQlVxVHdQZz09
LOCATION:4/3-006 - TH Conference Room (CERN)
URL:https://indico.cern.ch/event/1745641/
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