One-particle spectral properties of 1D Mott-Hubbard insulators

We use an exact holon and spinon Landau-liquid functional, which describes the holon-spinon interactions at all scattering orders, to study correlatio n functions of integrable multicomponent many-particle problems showing bot h linear and nonlinear energy bands. Motivated by recent photoemission expe riments, we consider specific cases when the dominant nonlinear band terms are quadratic and apply our results to the evaluation of the half-filling 1 D Hubbard model one-particle spectral functions beyond conformal field theo ry.