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SUMMARY:Riccardo Gonzo (U. Southampton) - Ultra-relativistic gravitational
  scattering: where are we?
DTSTART:20260930T130000Z
DTEND:20260930T140000Z
DTSTAMP:20261001T075900Z
UID:indico-event-2224@indico.uu.se
DESCRIPTION:Speakers: Riccardo Gonzo (U. Southampton)\n\nHigh-energy gravi
 tational scattering provides a remarkably simple window into the nonlinear
  dynamics of general relativity in the most extreme regime. In the Regge 
 limit\, where the center-of-mass energy is much larger than the momentum t
 ransfer\, the interaction admits a natural description in terms of gravita
 tional shock waves. I will first review the exponentiation of the S-matr
 ix in impact parameter space and I will show how multi-Regge factorization
  reorganizes gravitational amplitudes into impact factors\, Lipatov curren
 ts and transverse propagators\, giving a perturbative description of shock
  wave dynamics. In particular\, I will discuss the emergence of the H dia
 gram and its higher multi-H generalizations\, and explain the distinction 
 between quantum-suppressed BFKL-type evolution and genuinely classical lea
 ding log contributions. Finally\, I will comment on how this ultra-relati
 vistic scattering picture extends beyond flat space\, from boundary correl
 ators in AdS to cosmological correlators in dS.\n\nhttps://indico.uu.se/ev
 ent/2224/
LOCATION:92110
URL:https://indico.uu.se/event/2224/
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