Coupling between Galileon and massive gravity with composite metrics
arXiv:1412.8471 · doi:10.1103/PhysRevD.92.044057
Abstract
We investigate the coupling between a Galileon scalar field and massive gravity through composite metrics. We derive the full set of equations of motion for a flat Friedmann-Robertson-Walker background, and study linear perturbations around it. Generally, the nonminimal coupling with the composite metric will excite all 6 degrees of freedom of the spatial metric perturbations, one of which may correspond to the Boulware-Deser ghost.
23 pages, no figure; v2 matches the PRD version
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