40 citations · 134 across the 4 of their papers we have counts for
4 papers
Positivity Bounds without Boosts
Tanguy Grall, Scott Melville
We derive the first positivity bounds for low-energy Effective Field Theories (EFTs) that are not invariant under Lorentz boosts. "Positivity bounds" are the low-energy manifestati…
The Cosmological Phonon: Symmetries and Amplitudes on Sub-Horizon Scales
Tanguy Grall, Sadra Jazayeri, David Stefanyszyn
In contrast to massless spinning particles, scalars are not heavily constrained by unitarity and locality. Off-shell, no gauge symmetries are required to write down manifestly loca…
Inflation in Motion: Unitarity Constraints in Effective Field Theories with Broken Lorentz Symmetry
Tanguy Grall, Scott Melville
During inflation, there is a preferred reference frame in which the expansion of the background spacetime is spatially isotropic. In contrast to Minkowski spacetime, observables ca…
Symmetric Scalars
Tanguy Grall, Sadra Jazayeri, Enrico Pajer
We provide a complete classification of Poincaré-invariant scalar field theories with an enlarged set of classical symmetries to leading order in derivatives, namely for the so-cal…