Nicolas Boulanger (Université de Mons)
We review a construction giving a (non-standard) action principle for
Vasiliev's fully nonlinear equations of motion for bosonic higher spin
gauge fields in four spacetime dimensions. It is based on a
generalized Hamiltonian sigma model and produces the expected
amplitudes related to the 3D free O(N) model.
We then proceed with the BRST-BV quantization following the