BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:An Invitation to Celestial Amplitudes - Sabrina Pasterski\, Prince
 ton University
DTSTART:20211103T153000Z
DTEND:20211103T163000Z
UID:TALK164431@talks.cam.ac.uk
CONTACT:104116
DESCRIPTION:Celestial Holography proposes a duality between gravitational 
 scattering in spacetimes with vanishing cosmological constant and a confor
 mal field theory living on the celestial sphere.   It maps four-dimensiona
 l scattering matrix elements to  objects that transform as two-dimensional
  conformal correlators\, termed Celestial Amplitudes. This map possesses a
  number of surprising features. It emphasizes infinite-dimensional symmetr
 y enhancements\, which are typically hidden in infrared factorization theo
 rems for amplitudes\; reorganizes collinear limits as conformal field theo
 ry operator product expansions\, and mixes ultraviolet and infrared behavi
 or in a manner that may allow us to make general claims about scattering n
 ot obvious from perturbation theory.\n\nWe will start by reviewing how inf
 rared physics points to symmetry enhancements\, show why this footing lead
 s us to Celestial Holography\, and then review recent progress in construc
 ting the holographic dictionary.
LOCATION:ONLINE - Details to be sent by email
END:VEVENT
END:VCALENDAR