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SUMMARY:The S-matrix strikes back - Miguel Paulos (CNRS)
DTSTART:20171005T120000Z
DTEND:20171005T130000Z
UID:TALK78991@talks.cam.ac.uk
CONTACT:Dr. Carl Turner
DESCRIPTION:In this talk I will describe recent work aiming to reinvigorat
 e the 50 year old S-matrix program\, which seeks to constrain scattering o
 f massive particles non-perturbatively. I will begin by considering quantu
 m fields in anti-de Sitter space and show that one can extract information
  about the S-matrix by considering correlators in conformally invariant th
 eories. The latter can be studied with "bootstrap" techniques\, which allo
 w us to constrain the S-matrix. I will also show that this can be done dir
 ectly\, without using the CFT crutch\, by using crossing symmetry and unit
 arity and a particular ansatz. In this way we derive universal bounds on Q
 FTs in 2\,3 and 4 dimensions. 
LOCATION:Potter Room (first floor\, Pav. B)
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