Excitations in a Bose-condensed Liquid [Paperback]

An up-to-date account of the microscopic theory of the dynamics of superfluid 4He.An up-to-date account of the microscopic theory of the dynamics of superfluid 4He, with a focus on the pivotal role of the Bose condensate. The book gives a systematic account of excitations in both the hydrodynamic and collisionless frequency regions.An up-to-date account of the microscopic theory of the dynamics of superfluid 4He, with a focus on the pivotal role of the Bose condensate. The book gives a systematic account of excitations in both the hydrodynamic and collisionless frequency regions.This volume gives an up-to-date, systematic account of the microscopic theory of Bose-condensed fluids developed since the late 1950s. The core of the present book is the development of the field-theoretic analysis needed to deal with a Bose-condensed fluid. However, the author also brings out the essential physics behind the formal Green's function techniques and presents plausible scenarios to understand recent high resolution neutron and Raman scattering data. The first three chapters give a useful overview and introductory material while the concluding chapter gives an assessment and suggestions for further research.Preface; 1. Excitations in superfluid 4He: an introduction; 2. Dynamic response of helium atoms to thermal neutrons; 3. Bose broken symmetry and its implications; 4. High momentum scattering and the condensate fraction; 5. Dielectric formalism for a Bose fluid; 6. Response functions in the low frequency, long wavelength limit; 7. Phonons, maxons and rotons; 8. Sum rule analysis of the different contributions to dynamic structure analysis; 9. Variational and parameterized approaches; 10. Two-particle spectrum in Bose-condensed fluids; 11. Relation between excitations in liquid and solid helium; 12. The new picture: some unsolved problems.'This book was a godsend to me! & a subject to which the author has made very substantial contributions & I strongly recommend this book anlsÚ