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- TL;DR Summary
- Modified Newtonian Dynamics + dark matter

what about Modified Newtonian Dynamics + dark matter both right and both correct

Garry W. Angus

If no sterile neutrinos then Modified Newtonian Dynamics + primordial black holes

### Are sterile neutrinos consistent with clusters, the CMB and MOND?

Garry W. Angus

arXiv:0805.4014 [If a single sterile neutrino exists such that mνs∼11eV, it can serendipitously solve all outstanding issues of the Modified Newtonian Dynamics. With it one can explain the dark matter of galaxy clusters without influencing individual galaxies, match the angular power spectrum of the cosmic microwave background and potentially fit the matter power spectrum. This model is flat with Ωνs∼0.23 and the usual baryonic and dark energy components, thus the Universe has the same expansion history as the $\lcdm$ model and only differs at the galactic scale where the Modified Dynamics outperforms $\lcdm$ significantly.

If no sterile neutrinos then Modified Newtonian Dynamics + primordial black holes

### Primordial Black Holes as Dark Matter: Recent Developments

Bernard Carr1 and Florian Kühnel2· Cited by 280## Abstract

Although the dark matter is usually assumed to be made up of some form of elementary particle, primordial black holes (PBHs) could also provide some of it. However, various constraints restrict the possible mass windows to 1016–1017 g, 1020–1024 g, and 10–103*M*⊙. The last possibility is contentious but of special interest in view of the recent detection of black hole mergers by LIGO/Virgo. PBHs might have important consequences and resolve various cosmological conundra even if they account for only a small fraction of the dark matter density. In particular, those larger than 103*M*⊙ could generate cosmological structures through the seed or Poisson effect, thereby alleviating some problems associated with the standard cold dark matter scenario, and sufficiently large PBHs might provide seeds for the supermassive black holes in galactic nuclei. More exotically, the Planck-mass relics of PBH evaporations or stupendously large black holes bigger than 1012*M*⊙ could provide an interesting dark component.