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SUMMARY:Positivity Constraints on Lorentz-breaking EFTs - Paolo Creminelli
  (ICTP\, Trieste)
DTSTART:20231205T140000Z
DTEND:20231205T150000Z
UID:TALK209269@talks.cam.ac.uk
CONTACT:Dr  Dong-Gang Wang
DESCRIPTION:The coefficients of the operators of an effective field theory
  (EFT) are constrained to satisfy certain inequalities\, under the (mild) 
 assumption that the UV completion satisfies general requirements of causal
 ity and unitarity. I discuss the extension of these ideas to theories wher
 e the Lorentz symmetry is spontaneously broken\, as it happens in cosmolog
 y and condensed matter physics. I explain why the use of the S-Matrix run 
 into immediate problems. Constraints can be derived using dispersive argum
 ents for the 2-point function of conserved currents and applied to models 
 of interest in high-energy and condensed matter.
LOCATION:CMS\, Pav. B\, Meeting Room 11 (MR11)
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