Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-08-07
Phys.Rev.D82:124018,2010
Physics
High Energy Physics
High Energy Physics - Theory
34 pages, 2 figures. v2 typos corrected, comments added, version appearing in PRD
Scientific paper
10.1103/PhysRevD.82.124018
In the decoupling limit, the DGP model reduces to the theory of a scalar field pi, with interactions including a specific cubic self-interaction - the galileon term. This term, and its quartic and quintic generalizations, can be thought of as arising from a probe 3-brane in a 5-dimensional bulk with Lovelock terms on the brane and in the bulk. We study multi-field generalizations of the galileon, and extend this probe brane view to higher co-dimensions. We derive an extremely restrictive theory of multiple galileon fields, interacting through a quartic term controlled by a single coupling, and trace its origin to the induced brane terms coming from Lovelock invariants in the higher co-dimension bulk. We explore some properties of this theory, finding de Sitter like self accelerating solutions. These solutions have ghosts if and only if the flat space theory does not have ghosts. Finally, we prove a general non-renormalization theorem: multi-field galileons are not renormalized quantum mechanically to any loop in perturbation theory.
Hinterbichler Kurt
Trodden Mark
Wesley Daniel
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