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We introduce the spin-charge separation mechanism to the quark-leptonunification models which consider the lepton number as the fourth color. Incertain finite-density systems, quarks and leptons are decomposed into spinonsand chargons, which carry the spin and charge degrees of freedom respectively.Neutrinos can be related to the spinons with respect to the electric-charge andspin separation in the early universe or other circumstances. Some effective,probably universal couplings between the spinon sector and the chargon sectorare derived and a phenomenological description for the chargon condensate isproposed. It is then demonstrated that the spinon current can induce vorticityin the chargon condensate, and spinon zero modes are trapped in the vortices,forming spinon-vortex bound states. In cosmology this configuration may lead tothe emission of extremely high energy neutrinos when vortices split andreconnect.

From the Fourth Color to Spin-charge Separation - Neutrinos and Spinons