Gauged Galileons From Branes
  We show how the coupling of SO(N) gauge fields to galileons arises from a probe brane construction. The galileons arise from the brane bending modes of a brane probing a co-dimension N bulk, and the gauge fields arise by turning on certain off-diagonal components in the zero mode of the bulk metric. By construction, the equations of motion for both the galileons and gauge fields remain second order. Covariant gauged galileons are derived as well. 
Garrett Goon, Kurt Hinterbichler, Austin Joyce, Mark Trodden
hep-th gr-qc