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Covariant Galileon

C. Deffayet 1 G. Esposito-Farese A. Vikman
APC (UMR_7164) - AstroParticule et Cosmologie, Institut für theoretische Physik
Abstract : 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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Submitted on : Thursday, January 15, 2009 - 11:33:46 AM
Last modification on : Saturday, September 19, 2020 - 4:52:33 AM

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C. Deffayet, G. Esposito-Farese, A. Vikman. Covariant Galileon. Physical Review D, American Physical Society, 2009, 79, pp.084003. ⟨10.1103/PhysRevD.79.084003⟩. ⟨in2p3-00353276⟩



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