2016/09/30 by Dmitry Ponomarev, E. D. Skvortsov · 1 citation
Physics and Astronomy · #hep-th
paper · pdf · doi:10.1088/1751-8121/aa56e7
26+Appendices=37 pages; one ref added
arxiv created 2017/01/13 · arxiv updated 2017/03/08
We revisit the problem of interactions of higher-spin fields in flat space. We argue that all no-go theorems can be avoided by the light-cone approach, which results in more interaction vertices as compared to the usual covariant approaches. It is stressed that there exist two-derivative gravitational couplings of higher-spin fields. We show that some reincarnation of the equivalence principle still holds for higher-spin fields - the strength of gravitational interaction does not depend on spin. Moreover, it follows from the results by Metsaev that there exists a complete chiral higher-spin theory in four dimensions. We give a simple derivation of this theory and show that the four-point scattering amplitude vanishes. Also, we reconstruct the quartic vertex of the scalar field in the unitary higher-spin theory, which turns out to be perturbatively local.