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SUMMARY:A Celestial Dual for MHV Amplitudes - Walker Melton\, Harvard
DTSTART:20241114T130000Z
DTEND:20241114T140000Z
UID:TALK220594@talks.cam.ac.uk
CONTACT:Bernardo Zan
DESCRIPTION:Celestial holography posits that the 4D S-matrix may be calcul
 ated holographically by a 2D conformal field theory. However\, bulk transl
 ation invariance forces low-point massless celestial amplitudes to be dist
 ributional\, which is an unusual property for a 2D CFT. In this talk\, I s
 how that translation-invariant MHV gluon amplitudes can be extracted from 
 smooth 'leaf' amplitudes\, where a bulk interaction vertex is integrated o
 nly over a hyperbolic slice of spacetime. After describing gluon leaf ampl
 itudes' soft and collinear limits\, I will show that MHV leaf amplitudes c
 an be generated by a simple 2D system of free fermions and the semiclassic
 al limit of Liouville theory\, showing that translation-invariant\, distri
 butional amplitudes can be obtained from smooth correlation functions. An 
 important step is showing that\, in the semiclassical limit of Liouville t
 heory\, correlation functions of light operators are given by contact AdS 
 Witten diagrams. This talk is based on a series of papers with Atul Sharma
 \, Andrew Strominger\, and Tianli Wang [2312.07820\, 2402.04150\,2403.1889
 6]. 
LOCATION:Potter Room (B1.19)
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