There was an interesting, but slightly confusing article on the BBC news website on dark matter.
BBC News - Dwarf galaxies suggest dark matter theory may be wrong
This chap's computer models suggest that cold dark matter does not fit observations of dwarf galaxies, and that warm dark matter may be a better fit.
Most of my reading on warm dark matter seemed to indicate it had been dismissed for galaxy formation?
Is it assumed or possible that warm dark matter cools by interaction with normal matter in large galaxies?
I thought these were different particles altogether?