THE ANHARMONIC ELECTRON-PHONON PROBLEM

The anharmonic electron-phonon problem is solved in the infinite-dimen sional limit using quantum Monte Carlo simulation. Charge-density-wave order is seen to remain at half filling even though the anharmonicity removes the particle-hole symmetry of the model. Superconductivity is strongly favored away from half filling but the anharmonicity does no t enhance transition temperatures over the maximal values found in the harmonic limit.