MULTIORBITAL HUBBARD-MODEL IN INFINITE DIMENSIONS - QUANTUM MONTE-CARLO CALCULATION

Using the quantum Monte Carlo technique we compute thermodynamics and spectra for the orbitally degenerate Hubbard model in infinite spatial dimensions. With increasing orbital degeneracy we find in the one-par ticle spectra broader Hubbard bands (consistent with increased kinetic energy), a narrowing Mon gap, and increasing quasiparticle spectral w eight. Hund's rule exchange coupling decreases the critical on-site Co ulomb energy for the Mott transition. The metallic regime resistivity for twofold degeneracy is quadratic in temperature at low temperatures .