Scalar-tensor theories and cosmology
Abstract
Scalar-tensor theories are the best motivated alternatives to general relativity and provide a mathematically consistent framework to test the various observable predictions. They can involve three functions of the scalar field: (i) a potential (as in "quintessence" models), (ii) a matter-scalar coupling function (as in "extended quintessence", where it may also be rewritten as a nonminimal coupling of the scalar field to the scalar curvature), and (iii) a coupling function of the scalar field to the Gauss-Bonnet topological invariant. We recall the main experimental constraints on this class of theories, and underline that solar-system, binary-pulsar, and cosmological observations give qualitatively different tests. We finally show that the combination of these data is necessary to constrain the existence of a scalar-Gauss-Bonnet coupling.
Cite
@article{arxiv.gr-qc/0306018,
title = {Scalar-tensor theories and cosmology},
author = {Gilles Esposito-Farese},
journal= {arXiv preprint arXiv:gr-qc/0306018},
year = {2007}
}
Comments
8 pages, 2 figures, uses "moriond.sty", contribution to the XXXVIIIth Rencontres de Moriond on Gravitational Waves and Experimental Gravity, Les Arcs (France), March 23-29 2003