3+3

Having pondered LUX's null result for a while, I am inclined to think that keV-scale warm dark matter is the simplest model of dark matter now, and that the simplest model of that, would be a keV-mass right-handed neutrino.

I see that back in June I talked about a "3+4" neutrino paradigm for dark matter. If the CDMS signal was just background, I guess the paradigm should shrink to 3+3.

I was never too committed to this approach in the first place. It was just a starting point, with many details lacking. For example, I had no model for how the O(100) and O(300) GeV signals might be produced by right-handed neutrinos. I still don't. But until I have a better idea of comparable concreteness, it stands as the official theory of this blog...