Cosmic microwave background constraints on the strong equivalence principle

V. Boucher, J.-M. Gérard, P. Vandergheynst, and Y. Wiaux
Phys. Rev. D 70, 103528 – Published 29 November 2004

Abstract

We study the effect of a violation of the strong equivalence principle (SEP) on the cosmic microwave background (CMB). Such a violation would modify the weight of baryons in the primordial gravitational potentials and hence their impact in the establishment of the photon-baryon plasma acoustic oscillations before recombination. This cosmological Nordtvedt effect alters the odd peaks height of the CMB temperature anisotropy power spectrum. A gravitational baryonic mass density of the Universe may already be inferred at the first peak scale from the analysis of Wilkinson microwave anisotropy probe (WMAP) data. Experimental constraints on a primordial SEP violation are derived from a comparison with the Universe’s inertial baryonic mass density measured either in a full analysis of the CMB, or in the framework of the standard big bang nucleosynthesis (BBN).

  • Received 27 July 2004

DOI:https://doi.org/10.1103/PhysRevD.70.103528

©2004 American Physical Society

Authors & Affiliations

V. Boucher1, J.-M. Gérard1, P. Vandergheynst2, and Y. Wiaux2,*

  • 1Institut de Physique Théorique, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
  • 2Signal Processing Institute, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland

  • *Electronic address: yves.wiaux@epfl.ch

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Issue

Vol. 70, Iss. 10 — 15 November 2004

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