Cosmic microwave background constraints on the strong equivalence principle
(2004) Physical Review D (Particles, Fields, Gravitation and Cosmology) — Vol. D70, p. 103528 (2004)
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- (en) 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 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). Comment: Version accepted for publication in Phys. Rev. D, 8 pages, Revtex 4; discussion of "Experimental constraints" extended, references added, typos corrected
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Boucher, V., Gérard, J.-M., Vandergheynst, P., & Wiaux, Y. (2004). Cosmic microwave background constraints on the strong equivalence principle. Physical Review D (Particles, Fields, Gravitation and Cosmology), D70, 103528. https://doi.org/10.1103/PhysRevD.70.103528 (Original work published 2004)