... elementary particle physics, in nuclear physics, and in classical statistical mechanics. In elementary par-ticle physics, large numbers of real or virtual particles can be excited in scatteringexperiments. ... Statistical Physics G. Mahan, Many-Particle Physics A. Fetter and J. Walecka, Quantum Theory of Many-Particle SystemsS. Doniach and Sondheimer, Green’s Functions for Solid State PhysicistsJ. R. Schrieffer, ... length scales much longer than its lattice spacing, a crystalline solid can bemodelled as an elastic medium. We replace u(Ri)byu(r) (i.e. we replace the latticevectors,Ri, by a continuous...