Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
Volume 20, Issue 14, Pages 2749-2753Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271811020561
Keywords
Cosmology; dark matter
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Funding
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0908072] Funding Source: National Science Foundation
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Gravitational potentials in the cosmos are deeper than expected from observed visible objects, a phenomenon usually attributed to dark matter, presumably in the form of a new fundamental particle. Until such a particle is observed, the jury remains out on dark matter, and modified gravity models must be considered. The class of models reducing to modified Newtonian dynamics (MOND) in the weak field limit does an excellent job fitting the rotation curves of galaxies, predicting the relation between baryonic mass and velocity in gas-dominated galaxies, and explaining the properties of the local group. Several of the initial challenges facing MOND have been overcome, while others remain. Here we point out the most severe challenge facing MOND.
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