Late-time cosmology of a scalar-tensor theory with a universal multiplicative coupling between the scalar field and the matter Lagrangian

Olivier Minazzoli and Aurélien Hees
Phys. Rev. D 90, 023017 – Published 22 July 2014

Abstract

We investigate the late-time cosmological behavior of scalar-tensor theories with a universal multiplicative coupling between the scalar field and the matter Lagrangian in the matter era. This class of theory encompasses the case of the massless string dilaton [see Damour and Polyakov, General Relativity and Gravitation 26, 1171 (1994)] as well as a theory with an intrinsic decoupling mechanism in the solar system [see Minazzoli and Hees, Phys. Rev. D 88, 041504 (2013)]. The cosmological evolution is studied in the general relativity limit justified by solar system constraints on the gravitation theory. The behavior of these cosmological evolutions are then compared to two types of observations: the constraints on temporal variations of the constants of nature and the distance-luminosity measurements. In particular, the nonminimal coupling implies that the distance-luminosity relation is modified compared to general relativity. Theories producing a cosmological behavior in agreement with these observations are identified.

  • Received 16 April 2014

DOI:https://doi.org/10.1103/PhysRevD.90.023017

© 2014 American Physical Society

Authors & Affiliations

Olivier Minazzoli*

  • UMR ARTEMIS, CNRS, University of Nice Sophia-Antipolis, Observatoire de la Côte d’Azur, BP4229, 06304 Nice Cedex 4, France

Aurélien Hees

  • Department of Mathematics, Rhodes University, Grahamstown 6140, South Africa

  • *ominazzoli@gmail.com
  • aurelien.hees@gmail.com

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Issue

Vol. 90, Iss. 2 — 15 July 2014

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