Department of Physics, Saga University, Saga 840-8502, Japan Abstract Using a phenomenological model with vector-type interactions, we discuss a role of repulsive force in the quark-hadron phase transition at high density. For realization of the quark phase at high density, strong vector coupling is needed in the hadron phase, while it is forbidden in the quark phase. For the quark-phase, a NJL...

We propose a renormalizable model with no fundamental scalars which breaks itself in the manner of a “tumbling” gauge theory down to the standard model with a top-quark condensate. Because of anomaly cancellation requirements, this model contains two color sextet fermions (quixes), which are vector-like with respect to the standard model gauge group. The model also has a large number of pseudo-...

Recent development of the universal seesaw mass matrix model is reviewed. The model was proposed in order to explain why quark and lepton masses are so small compared with the electroweak scale ΛL = 〈φL〉 = 174 GeV. However, the recently observed top-quark mass mt ≃ 180 GeV seems to make an objection against the seesaw mass picture. For this problem, it has recently pointed out that the seesaw m...