QG group meeting: Spinor-helicity variables for the de Sitter causal patch

This is the weekly QG group meeting.
Speaker: Yasha Neiman (~60kg).
Title: Spinor-helicity variables for the de Sitter causal patch.

I will present a formalism for higher-spin holography that is intermediate between twistors and boundary bilocals, and closely resembles the famous spinor-helicity formalism for massless fields in Minkowski space. This is my current best guess for the best variables with which to attack higher-spin holography in an observable patch of (elliptic) de Sitter space. The story provides a very simple example for some deep lessons about how QFT compromises between locality, gauge redundancy, manifest global symmetry and the existence of an action.