Author ORCID Identifier
Document Type
Article
Publication Date
8-10-2004
Abstract
I present a model devoid of nonbaryonic cold dark matter (CDM) that provides an acceptable fit to the Wilkinson Microwave Anisotropy Probe (WMAP) data for the power spectrum of temperature fluctuations in the cosmic background radiation. An a priori prediction of such no-CDM models was a first-to-second peak amplitude ratio A1:2 ≈ 2.4. WMAP measures A1:2 = 2.34 ± 0.09. The baryon content is the dominant factor in fixing this ratio; no-CDM models that are consistent with the WMAP data are also consistent with constraints on the baryon density from the primordial abundances of 2H, 4He, and 7Li. However, in order to match the modest width of the acoustic peaks observed by WMAP, a substantial neutrino mass is implied: mν≈ 1 eV. Even with such a heavy neutrino, structure is expected to form rapidly under the influence of modified Newtonian dynamics. Consequently, the epoch of reionization should occur earlier than is nominally expected in ΛCDM. This prediction is realized in the polarization signal measured by WMAP. An outstanding test is in the amplitude of the third acoustic peak. Experiments that probe high l appear to favor a third peak that is larger than predicted by the no-CDM model.
Keywords
cosmic microwave background, cosmology: observations, dark matter, gravitation
Language
English
Publication Title
Astrophysical Journal
Grant
206078
Rights
© The American Astronomical Society. All rights reserved. This content is free to access, download, and share. For all other uses, you must obtain permission to reuse content: https://journals.aas.org/article-charges-and-copyright/#AAS_material
Recommended Citation
Stacy S. McGaugh 2004. Confrontation of Modified Newtonian Dynamics Predictions with Wilkinson Microwave Anisotropy Probe First Year Data. ApJ 611 26
Manuscript Version
Final Publisher Version