Covariantized vector Galileons

Matthew Hull, Kazuya Koyama, Gianmassimo Tasinato

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Abstract

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. Moreover, working in analogy with the scalar counterpart, we find indications for the existence of a ‘beyond Horndeski’ theory involving vector degrees of freedom, that avoids the propagation of ghosts thanks to secondary constraints. In addition, we analyze a Higgs mechanism for generating vector Galileons through spontaneous symmetry breaking, and we present its consistent covariantisation.
Original languageEnglish
Article number064012
JournalPhysical Review D
Volume93
Issue number6
DOIs
Publication statusPublished - 4 Mar 2016

Keywords

  • RCUK
  • STFC
  • ST/H005498/1
  • ST/K00090X/1

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