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Abstract: In the decoupling limit, the DGP model reduces to the theory of a scalarfield pi, with interactions including a specific cubic self-interaction - thegalileon term. This term, and its quartic and quintic generalizations, can bethought of as arising from a probe 3-brane in a 5-dimensional bulk withLovelock terms on the brane and in the bulk. We study multi-fieldgeneralizations of the galileon, and extend this probe brane view to higherco-dimensions. We derive an extremely restrictive theory of multiple galileonfields, interacting through a quartic term controlled by a single coupling, andtrace its origin to the induced brane terms coming from Lovelock invariants inthe higher co-dimension bulk. We explore some properties of this theory,finding de Sitter like self accelerating solutions. These solutions have ghostsif and only if the flat space theory does not have ghosts. Finally, we prove ageneral non-renormalization theorem: multi-field galileons are not renormalizedquantum mechanically to any loop in perturbation theory.

Autor: Kurt Hinterbichler, Mark Trodden, Daniel Wesley


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