| Speaker: | Leonardo Senatore (ETH Zurich) |
|---|---|
| Title: | Positivity bounds on effective field theories with spontaneously broken Lorentz invariance |
| Date (JST): | Tue, Oct 04, 2022, 15:00 - 16:30 |
| Place: | Zoom |
| Abstract: | We derive positivity bounds on EFT coefficients in theories where boosts are spontaneously broken. We employ the analytic properties of the retarded Green’s function of conserved currents (or of the stress-energy tensor) and assume the theory becomes conformal in the UV. The method is general and applicable to both cosmology and condensed matter systems. As a concrete example, we look at the EFT of conformal superfluids which describes the universal low-energy dynamics of CFT’s at large chemical potential and we derive inequalities on the coefficients of the operators, in three dimensions, at NLO and NNLO. |
