Covariant Galileon

Details Covariant Galileon Covariant Galileon

2009-01-09

arxiv.org/abs/0901.1314v2

Phys.Rev.D79:084003,2009

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, no figure, RevTeX4 format; v2 adds footnote 1, Ref. [12], reformats the link in Ref. [14], and corrects very minor t

Scientific paper

10.1103/PhysRevD.79.084003

We consider the recently introduced "galileon" field in a dynamical spacetime. When the galileon is assumed to be minimally coupled to the metric, we underline that both field equations of the galileon and the metric involve up to third-order derivatives. We show that a unique nonminimal coupling of the galileon to curvature eliminates all higher derivatives in all field equations, hence yielding second-order equations, without any extra propagating degree of freedom. The resulting theory breaks the generalized "Galilean" invariance of the original model.

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