witam cosmo-torun
http://cosmo.torun.pl/Cosmo/ToK070215RoughNotes
The arguments for the Light Dark Matter hypothesis look impressive to me. E.g. the link between the LDM particle mass and the neutrino mass.
If you don't understand the notes, well, probably most of it is already in astro-ph, hep-ph, etc.
pozdr boud