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SUMMARY:Positivity in EFTs with spontaneously broken boosts - Oliver Janss
 en - ICTP
DTSTART:20221128T130000Z
DTEND:20221128T140000Z
UID:TALK183242@talks.cam.ac.uk
CONTACT:Francesco
DESCRIPTION:I will discuss positivity bounds on EFT coefficients in theori
 es where Lorentz boosts are spontaneously broken. The well-known S-matrix 
 argument from the Lorentz-invariant scenario does not straightforwardly ge
 neralize to this case. Instead the analytic properties of the retarded Gre
 en’s function of conserved currents (or of the stress-energy tensor) wil
 l be used\, and the theory will be assumed to become conformal in the UV. 
 The method is general and applicable to both cosmology and condensed matte
 r systems. As a concrete example we will consider the EFT of conformal sup
 erfluids\, which describes the universal low-energy dynamics of CFTs at la
 rge U(1) charge\, and we will derive inequalities on the coefficients of t
 he operators\, in three spacetime dimensions\, at NLO and NNLO.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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