# Cosmic microwave background constraints on the strong equivalence principle

@article{Boucher2004CosmicMB,
title={Cosmic microwave background constraints on the strong equivalence principle},
author={Vincent Boucher and J. M. Gerard and Pierre Vandergheynst and Y. Wiaux Universite catholique de Louvain and Louvain-la-Neuve and Belgium and Swiss Federal Institute of Technology and Lausanne and Switzerland.},
journal={Physical Review D},
year={2004},
volume={70},
pages={103528}
}
• Published 10 July 2004
• Physics
• Physical Review D
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…
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