Testing a non-minimal coupling between matter and curvature

Abstract

One of the most interesting and current phenomenological extensions of General Relativity is the so-called $f(R)$ class of theories; a natural generalization of this includes an explicit non-minimal coupling between matter and curvature. The purpose of this work is to present a unified view of the applicability of the latter to various contexts, ranging from astrophysical matter distributions to a cosmological setting. Various results are discussed, including the impact of this non-minimal coupling in the choice of Lagrangian density, a mechanism to mimic galactic dark matter and a Cosmological Constant at a astrophysical scale, the possibility of accounting for the accelerated expansion of the Universe and modifications to post-inflationary reheating. The equivalence between a model exhibiting a non-minimal coupling and multi-scalar-theories is also discussed.

11 pages, 3 figures. To appear in the Proceedings of the "QSO Astrophysics, Fundamental physics, and Astrometric Cosmology in the Gaia era" GREAT-ESF Workshop, 6-9 June 2011, Faculdade de Ciências da Universidade do Porto, Portugal