1.
Phys Rev Lett
; 123(13): 131601, 2019 Sep 27.
Article
in English
| MEDLINE
| ID: mdl-31697530
ABSTRACT
We analyze the constraints imposed by gauge invariance on higher-order interactions between massless bosonic fields in three-dimensional higher-spin gravities. Focusing on the transverse-traceless part, we show that vertices of quartic and higher order that are independent of the cubic ones can only involve scalars and Maxwell fields. As a consequence, the full nonlinear interactions of massless higher-spin fields are completely fixed by the cubic vertex.