title: Reconstruction of a scalar-tensor theory of gravity in an accelerating universe
abstract: The present acceleration of the Universe strongly indicated by recent observational data can be modeled in the scope of a scalar-tensor theory of gravity. We show that it is possible to determine the structure of this theory along with the present density of dustlike matter from two observable cosmological functions: the luminosity distance and the linear density perturbation in the dustlike matter component as functions of redshift. Explicit results are presented in the first order in the small inverse Brans-Dicke parameter omega(-1).
authors.affiliation: Laboratoire de Mathematique et Physique Theorique, UPRES-A 6083 CNRS, Universite de Tours, Parc de Grandmont, F 37200 Tours, France.
authors.initials: B
authors.lastname: Boisseau
authors.initials: G
authors.lastname: Esposito-Farese
authors.initials: D
authors.lastname: Polarski
authors.initials: AA
authors.lastname: Starobinsky