(August 31, 2013 at 4:37 pm)Chuck Wrote:(August 31, 2013 at 10:24 am)little_monkey Wrote: Yes, indeed a strong point that MOND has over Dark Energy models is that it can make prediction, while DE can't as you have to figure what is the ratio DE/(ordinary) M for each galaxy, but MOND has one universal equation applied to every single galaxy. But as you've stated, the drawback is that they have to postulate a threshold acceleration. And to be a viable theory, it would need to explain this threshold. I don't think GR can help in that regard. But who knows!
Given the small magnitude of the threshold, maybe quantum mechanics would be a better place to look for the cause.
QM doesn't deal with acceleration at all. So nix that.
Quote:If I recall, excess mass implied by dark matter, but not MOND, is corroborated by several other lines of evidence, including behavior of galaxy clusters, gravitational lensing, and gravity induced redshifts. As I recall, these phenomenon behave inside the range predicted by dark matter, but outside the range consistent with MOND.
These are not predictions as such, but DE does explain these phenomena quite well. That's why I don't see a paradigm shift. Dark matter is here to stay for quite a while.
