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UID:20251122T130707EST-6606TKkwIU@132.216.98.100
DTSTAMP:20251122T180707Z
DESCRIPTION:Dispersion relations in conformal field theories.\n\nWell-known
  Kramers-Kronig dispersion relations relate the real and imaginary parts o
 f an analytic function with suitable properties. In physics this is often 
 used to reconstruct the real part of a scattering amplitude from its imagi
 nary part\, or absorptive part\, which may be easier to measure and/or to 
 compute. I will present a generalization to four-point correlators in any 
 conformal field theory. Since these are functions of a complex(ifed) geome
 try with a nontrivial topology\, the generalization turns out to involve e
 lliptic functions. I will illustrate it with applications to the gauge-gra
 vity (AdS/CFT) correspondence\, where this novel dispersion relation provi
 des a uniquely efficient tool for the computation of AdS Witten diagrams\,
  exploiting only with very limited information about their « absorbtive » 
 part from the underlying CFT.\n
DTSTART:20180220T203000Z
DTEND:20180220T213000Z
LOCATION:Room 4336\, CA\, Pav. André-Aisenstadt\, 2920\, ch. de la Tour
SUMMARY:Simon Caron Huot\, Dept. of physics\, ɬÀï·¬
URL:/mathstat/channels/event/simon-caron-huot-dept-phy
 sics-mcgill-university-285187
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