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SUMMARY:Anna Tokareva (Jyvaskyla U. and Moscow\, INR)
DTSTART:20210128T150000Z
DTEND:20210128T160000Z
DTSTAMP:20260423T003257Z
UID:IFTWeb/29
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/IFTWeb/29/">
 Massless Positivity</a>\nby Anna Tokareva (Jyvaskyla U. and Moscow\, INR) 
 as part of IFT-Madrid Webinars\n\n\nAbstract\nWe formulate Positivity Boun
 ds for scattering amplitudes including exchange of massless particles. We 
 generalize the standard construction through dispersion relations to inclu
 de the presence of a branch cut along the real axis in the complex plane f
 or the Maldestam variable s. In general\, validity of these bounds require
  the cancellation of divergences in the forward limit of the amplitude\, p
 roportional to 1/t and log(t). We show that this is possible in the case o
 f gravitons if one assumes a Regge behavior of the amplitude at high energ
 ies below the Planck scale. The bounds that we present have the potential 
 of constraining very general models of modified gravity and EFTs of matter
  coupled to gravitation.\n
LOCATION:https://researchseminars.org/talk/IFTWeb/29/
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