A Unified Approach to Nonequilibrium Phenomena in a Crystalline Lattice. II. Linear-Wave-Analysis

Abstract

By linearizing the basic equations derived in the preceding paper of the present series, nonequilibrium phenomena in a crystalline lattice at a finite temperature are studied. Time evolution of a distribution function for the phenomena can be classified into three characteristic ones. The first corresponds to an elastic wave in a lattice. Its mechanical and thermal properties, that is, dispersion relation, propagation velocities, amplitude ratios, average energy, and entropy are investigated. Some properties of the wave near a melting point are also discussed. Further, physical meanings of the two remainder are also discussed in detail, and a possible connection of these with conduction of heat is pointed out.