ABSTRACT
Thus far we have been concerned primarily with macroscopic properties of superfluid Bose liquids in general, and of He II in particular. Where we have been concerned with microscopic properties, as in Chapter 3, we have discussed phenomenological theories of superfluid behavior. We now wish to turn our attention to microscopic theories of interacting Bose systems, that class of theories which begin with a given law of interaction between the particles, and derive the various properties of the system therefrom.
