Approach unifying spin and charges
A paper Does dark matter consist of baryons of new stable family quarks? was recently published in Phys. Rev. D by the authors Gregor Bregar and Norma S. Mankoč Borštnik, who explains: "The approach unifying spin and charges of mine offers, as the only one in the published literature, a mechanism for the appearance of families. All other proposals either postulate the number of families, similarly as does the Standard model of the electroweak and colour interactions, or hide the number of families in the choice of the appropriate group. The approach unifying spin and charges consequently also offers a mechanism for the appearance of the Yukawa couplings which determine properties of quarks and leptons: their masses and mixing matrices. The approach predicts, in addition to the three measured families, the fourth family which is coupled to the known three families via Yukawa couplings and might be detected by the LHC. It also predicts the fifth family with masses above TeV/c2. Since the fifth family has no Yukawa couplings to the lighter four families and is consequently stable, it offers the answer to the question of what is the dark matter, which dominates ordinary matter by a factor of (5-7), made out of. The article published in Phys. Rev. D follows the evolution of the fifth family after the Big Bang. Quarks of this family decouple out of the plasma during the cooling down of the universe and, after binding into colourless neutrons, survive the colour phase transition. The fifth family neutrons constitute, together with the fifth family neutrinos, the present dark matter. We estimated properties of the fifth family quarks and leptons during the evolution of the universe, the interactions of the fifth family baryons among themselves and with the ordinary matter (mostly baryons of the first family) and explained the results of direct measurements."