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SUMMARY:Gravitational Regge bounds (CANCELLED) - Alexander Zhiboedov (CERN
 )
DTSTART:20220317T130000Z
DTEND:20220317T140000Z
UID:TALK168557@talks.cam.ac.uk
CONTACT:Chiung Hwang
DESCRIPTION:We review the basic assumptions and spell out the detailed arg
 uments that lead to the bound on the Regge growth of gravitational scatter
 ing amplitudes. The minimal extra ingredient compared to the gapped case -
  in addition to unitarity\, analyticity\, subexponentiality\, and crossing
  - is the assumption that scattering at large impact parameters is control
 led by known semi-classical physics. We bound the Regge growth of amplitud
 es both with the fixed transferred momentum and smeared over it. Our basic
  conclusion is that gravitational scattering amplitudes admit dispersion r
 elations with two subtractions. For a sub-class of smeared amplitudes\, bl
 ack hole formation reduces the number of subtractions to one. Finally\, us
 ing dispersion relations with two subtractions we derive bounds on the loc
 al growth of relativistic scattering amplitudes. Schematically\, the local
  bound states that the amplitude cannot grow faster than s^2.
LOCATION:Online (Zoom)
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