Weak field limit of higher dimensional massive Brans-Dicke gravity: Observational constraints


Akarsu Ö. , Chopovsky A., Shulga V., Yalçınkaya E. , Zhuk A.

PHYSICAL REVIEW D, vol.101, no.2, 2020 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 101 Issue: 2
  • Publication Date: 2020
  • Doi Number: 10.1103/physrevd.101.024004
  • Title of Journal : PHYSICAL REVIEW D

Abstract

We consider higher-dimensional massive Brans-Dicke theory with Ricci-flat internal space. The background model is perturbed by a massive gravitating source which is pressureless in the external (our space) but has an arbitrary equation-of-state parameter Omega in the internal space. We obtain the exact solution of the system of linearized equations for the perturbations of the metric coefficients and scalar field. For a massless scalar field, relying on the fine-tuning between the Brans-Dicke parameter omega and Omega, we demonstrate that (i) the model does not contradict gravitational tests relevant to the parameterized post-Newtonian parameter gamma, and (ii) the scalar field is not ghost in the case of nonzero vertical bar Omega vertical bar - O(1) along with the natural value vertical bar omega vertical bar- O(1). In the general case of a massive scalar field, the metric coefficients acquire the Yukawa correction terms, where the Yukawa mass scale m is defined by the mass of the scalar field. For the natural value omega - O(1), the inverse-square-law experiments impose the following restriction on the lower bound of the mass: m greater than or similar to 10(-11) GeV. The experimental constraints on gamma require that Omega be extremely close to -1/2.