113 citations · 890 across the 27 of their papers we have counts for
3 papers · 1 filter
The Boostless Bootstrap and BCFW Momentum Shifts
David Stefanyszyn, Jakub Supeł
In a recent paper [1], three-particle interactions without invariance under Lorentz boosts were constrained by demanding that they yield tree-level four-particle scattering amplitu…
The Boostless Bootstrap: Amplitudes without Lorentz boosts
Enrico Pajer, David Stefanyszyn, Jakub Supeł
Poincaré invariance is a well-tested symmetry of nature and sits at the core of our description of relativistic particles and gravity. At the same time, in most systems Poincaré in…
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…