Our colleagues in experimental physics can really help us out here. Detection of WIMPs would of course be most helpful. So would a mass measurement of a particle we actually know to exist - the neutrino. If mnu is near its lower limit (~0.02 eV), neutrinos would be inadequate to explain the residual mass discrepancy in rich clusters. While there could still be baryons unaccounted for there, such a situation would favor CDM and we would be stuck trying to understand how MONDian behavior arises from galaxy formation. On the other hand, a neutrino mass closer to the heavy end of the currently allowed range (~ 1 or 2 eV) would be about right for MOND in clusters and would cause insurmountable problems for structure formation in CDM.
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