Time magazine just ran an article “Cosmic Fuggedaboudit: Dark Matter May Not Exist At All” – a revisit of the MOND hypothesis.
Independent of these recent developments, it highlights the continued persistence of the notion that maybe Cold Dark Matter needs to be revisited.
Sean had good discussion of the issues over at Cosmic Variance last year, and recently Kroupa started a blog, the The Dark Matter Crisis, now at scilogs.com/the-dark-matter-crisis/
For what it is worth I’d take CDM over MOND, and I’d give modest odds.
I suspect we don’t know the whole story on CDM, yet. I personally lean to the notion that dark matter is complex, not just a single dominant WIMPy particle species, and that we’re seeing hints of dark matter chemistry, but that is speculative.
More intriguingly, we may be close to direct detection of dark matter, if it is dominated by a relatively low mass single species of WIMPs.
Either way, the matter will be settled by our discoveries of natural processes and systematic observations, not by theories or polemics.
So it goes.