2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18049We compute the correlation functions for antiferromagnetic and d-wave superconducting fermion bilinears in a generalized mean field type approximation for the Hubbard model. For high temperature our explicit expressions show that homogeneous field configurations are preferred for these composite bosons. Below a critical temperature we find spontaneous symmetry breaking with homogeneous expectation values of the composite fields. Our results can be used to device a nonperturbative flow equation for the exploration of the low temperature regime.29 pages, 5 figuresStrongly Correlated ElectronsSuperconductivityHigh Energy Physics - Theorytext