MOND is unnecessary

Abstract

Dark matter seems to account for flat velocity curves in spiral galaxies, with further evidence for dark matter from observations of the colliding "bullet cluster" galaxies 1E0657-56. However, the baryonic Tully-Fisher relation and the mass discrepancy-acceleration relation have been cited (arXiv:1112.3960) as "challenges for the LambdaCDM model." MOND (MOdified Newtonian Dynamics), a modified law of gravity,is invoked in arXiv:1112.3960 to account for those relations. This note shows that the HLSS model in arXiv:1301.0304, employing the holographic principle within the standard LambdaCDM paradigm, readily accounts for the MOND acceleration, the baryonic Tully-Fisher relation, and the mass discrepancy-acceleration relation. After first posting this note, I learned that Man Ho Chan (arXiv:1310.6801) previously reached the same conclusion using a dark matter based analysis independent of the holographic approach used in this paper. These results indicate that the MOND hypothesis is unnecessary.