http://xxx.lanl.gov/abs/astro-ph/0507619
Could someone who actually knows something about astrophysics care to comment? I note that it doesn’t appear to have been peer-reviewed yet.
If you read the various science magazines - Science News, New Scientist, Scientific American, Discover - you will spot someone’s theory on how to avoid dark matter - or dark energy or inflation or anything else you like - at least once a month. Although this is the way science advances, it’s best for laypeople to avoid paying close attention to them until the same theory keeps getting mentioned as an alternative in every article on the subject. And this happens so rarely it means it’s safe to ignore them almost entirely, except as fun reading.
You might want to read this reply (astro-ph/0508377), which claims that the model has a nonphysical distribution of matter (a singular disk at z=0). It’s pretty clear that because of the discontinuity in \Phi[sub]z[/sub], and thus in N[sub]z[/sub], Cooperstock&Tieu’s equation (11) is not satisfied at z=0. I can imagine that this could cause a density singularity too, but I haven’t checked that rigorously.