In this work we explore the viability of nonminimally coupled matter- curvature gravity theories, namely the conditions required for the absence of tachyon instabilities and ghost degrees of freedom. We contrast our finds with recent claims of a pathological behaviour of this class of models, which resorted to, in our view, an incorrect analogy with k-essence.
@article{arxiv.1406.6422,
title = {Viability of nonminimally coupled f (R) gravity},
author = {Orfeu Bertolami and Jorge Páramos},
journal= {arXiv preprint arXiv:1406.6422},
year = {2017}
}
Comments
13 pages. Accepted for publication in General Relativity and Gravitation