期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2015/02/018
关键词
modified gravity; dark energy theory
资金
- ANR (Agence Nationale de la Recherche) grant [STR-COSMO ANR-09-BLAN-0157-01]
- Programme National de Cosmologie and Galaxies (PNCG) of CNRS/INSU, France
- DOE [DE-FG02-11ER41743]
- A*MIDEX project - Investissements d'Avenir French Government program [ANR-11-IDEX-0001-02]
We have recently proposed a new class of gravitational scalar-tensor theories free from Ostrogradski instabilities, in ref. [1]. As they generalize Horndeski theories, or generalized galileons, we call them G(3). These theories possess a simple formulation when the time hypersurfaces are chosen to coincide with the uniform scalar field hypersurfaces. We confirm that they contain only three propagating degrees of freedom by presenting the details of the Hamiltonian formulation. We examine the coupling between these theories and matter. Moreover, we investigate how they transform under a disformal redefinition of the metric. Remarkably, these theories are preserved by disformal transformations that depend on the scalar field gradient, which also allow to map subfamilies of G(3) into Horndeski theories.
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