Cosmic microwave background constraints on the strong equivalence principle

Details Cosmic microwave background constraints on the strong equivalence principle Cosmic microwave background constraints on the strong equivalence principle

2004-07-10

arxiv.org/abs/astro-ph/0407208v2

Phys.Rev. D70 (2004) 103528

Astronomy and Astrophysics

Astrophysics

Version accepted for publication in Phys. Rev. D, 8 pages, Revtex 4; discussion of "Experimental constraints" extended, refere

Scientific paper

10.1103/PhysRevD.70.103528

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).

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