This book provides a unified account of the theory of quantum liquid and discusses the mathematical theory of linear response and correlations. It is helpful for experimental physicists working in the fields of low-temperature or solid-state physics.

Philippe Nozieres, David Pines

Publisher's Foreword -- Advanced Book Classics -- Special Preface -- Preface -- Introduction -- Experimental and Theoretical Background on he II -- Elementary Excitations -- Elementary Excitations in HE II -- Superfluid Behavior: Response to a Transverse Probe. Qualitative Behavior of a Superfluid -- Superfluid Flow: Macroscopic Limit -- Basis for The Two-Fluid Model -- First, Second, and Quasi-Particle Sound -- Vortex Lines -- Microscopic Theory: Uniform Condensate -- Microscopic Theory: Non-Uniform Condensate -- Conclusion