Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors

C. Deffayet^*
AstroParticule & Cosmologie, UMR 7164-CNRS, Université Denis Diderot-Paris 7, CEA, Observatoire de Paris, 10 rue Alice Domon et Léonie Duquet, F-75205 Paris Cedex 13, France

S. Deser^†
Physics Department, Brandeis University, Waltham, Massachusetts 02454, USA, and Lauritsen Laboratory, California Institute of Technology, Pasadena, California 91125, USA

G. Esposito-Farèse^‡
GReCO, Institut d’Astrophysique de Paris, UMR 7095-CNRS, Université Pierre et Marie Curie-Paris 6, 98bis boulevard Arago, F-75014 Paris, France

^*deffayet@iap.fr

^†deser@brandeis.edu

^‡gef@iap.fr