Gauged NJL-model at strong curvature

We investigate the gauged NJL-model in curved space-time using the RG formulation and the equivalency with the gauge Higgs-Yukawa model in a modified 1Nc expansion. The strong curvature induced chiral symmetry breaking is found in the non-perturbative RG approach (presumably equivalent to the ladder Schwinger-Dyson equations). The dynamically generated fermion mass is explicitly calculated and inducing of Einstein gravity is briefly discussed. This approach shows the way to the non-perturbative study of the dynamical symmetry breaking at external fields.