Covariantised Vector Galileons

Understand

Vector Galileons are ghost-free systems containing higher derivative interactions of vector fields.

• They break the vector gauge symmetry, and the dynamics of the longitudinal vector polarizations acquire a Galileon symmetry in an appropriate decoupling limit in Minkowski space.
• Using an ADM approach, we carefully reconsider the coupling with gravity of vector Galileons, with the aim of studying the necessary conditions to avoid the propagation of ghosts.
• We develop arguments that put on a more solid footing the results previously obtained in the literature.