Milestone 1: Operators at the late time boundary of de Sitter

As our first concrete step we have identified

boundary fields on de Sitter for scalar fields of various masses

in terms of the irreducible representations of the (d+1)-dimensional de Sitter symmetry group SO(d+1,1).

One can think of these irreducible representations as particles of a de Sitter Universe.  Here is an arxiv preprint of our work so far.