2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170011The importance of introducing the SO(5) singlet into the new novel model of non-Fermi liquid proposed by LeClair and collaborators is pointed out. This SO(5) singlet order parameter leads to a phase transition between the normal metal and the pseudogap region in the phase diagram for the anti-ferromagnetic (AF) phase and the (d-wave) superconducting (SC) phase. A non-zero value for this order can increase substantially the critical temperature of the SC transition.4 pages, 1 figure; putting back in the case with positive g_u couplingSuperconductivitytext