see synopsis below
"Physical Review Letters, Kevork Abazajian of the University of California, Irvine, shows that a sterile neutrino with a mass of 7 kilo-electron-volts (keV) could be a viable dark matter candidate that both explains the new x-ray data and solves some long-standing problems in galaxy structure formation."
this one actually looks rather good. Experimental observations always help a theory!
Synopsis: Sterile Neutrino as Dark Matter Candidate