Many-dimensional quantum energy flow at low energy

Criteria for ergodicity and rates of energy flow in a quantum mechanical system of N coupled anharmonic oscillators where N is large are determined at energies near the ground state of the system. High-order resonances are important for the transition at large N. The role of numerous virtual transitions, ''vibrational superexchange,'' in global transport is examined both for typical parts of the state space and special states often interrogated experimentally.