Higher spin theory in 3-dimensional flat space

Understand

We present the first example of a non-trivial higher spin theory in 3-dimensional flat space.

• We propose flat-space boundary conditions and prove their consistency for this theory.
• We find that the asymptotic symmetry algebra is a (centrally extended) higher spin generalization of the Bondi- Metzner-Sachs algebra, which we describe in detail.
• We also address higher spin analogues of flat space cosmology solutions and possible generalizations.