Allan Griffin works in theoretical condensed matter theory and is Professor Emeritus of Physics at the University of Toronto. He received his BSc (1960) and MSc (1961) from the University of British Columbia, and his PhD at Cornell University (1965). Dr Griffin has spent research sabbaticals at the KFA Julich (Germany), the Institut Laue-Langevin in Grenoble (France), Kyoto University (Japan), the University of Trento (Italy) and was a JILA Fellow at the University of Colorado (USA). His research has been on superfluid He4, superconductivity and theory of ultracold atoms. He has been a short-term visiting professor at the ANU in Canberra (Australia), the Collège de France in Paris, and the University of Otago (New Zealand). Dr Griffin is a Fellow of the Royal Society of Canada (2003), a Fellow of the American Physical Society (2004), and received the Bronze Medal from the Collège de France (2001). He is the author of a monograph on Bose liquids (1993) and the editor of a well-known book on Bose-Einstein condensation (1995), both published by Cambridge University Press.

'This book was a godsend to me! … a subject to which the author has made very substantial contributions … I strongly recommend this book and am very glad to have this book in my library. I am sure that it will be very greatly valued by beginners in the field.' Contemporary Physics

• 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.

Allan Griffin works in theoretical condensed matter theory and is Professor Emeritus of Physics at the University of Toronto. He received his BSc (1960) and MSc (1961) from the University of British Columbia, and his PhD at Cornell University (1965). Dr Griffin has spent research sabbaticals at the KFA Julich (Germany), the Institut Laue-Langevin in Grenoble (France), Kyoto University (Japan), the University of Trento (Italy) and was a JILA Fellow at the University of Colorado (USA). His research has been on superfluid He4, superconductivity and theory of ultracold atoms. He has been a short-term visiting professor at the ANU in Canberra (Australia), the Collège de France in Paris, and the University of Otago (New Zealand). Dr Griffin is a Fellow of the Royal Society of Canada (2003), a Fellow of the American Physical Society (2004), and received the Bronze Medal from the Collège de France (2001). He is the author of a monograph on Bose liquids (1993) and the editor of a well-known book on Bose-Einstein condensation (1995), both published by Cambridge University Press.

'This book was a godsend to me! … a subject to which the author has made very substantial contributions … I strongly recommend this book and am very glad to have this book in my library. I am sure that it will be very greatly valued by beginners in the field.' Contemporary Physics

• 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.

Allan Griffin works in theoretical condensed matter theory and is Professor Emeritus of Physics at the University of Toronto. He received his BSc (1960) and MSc (1961) from the University of British Columbia, and his PhD at Cornell University (1965). Dr Griffin has spent research sabbaticals at the KFA Julich (Germany), the Institut Laue-Langevin in Grenoble (France), Kyoto University (Japan), the University of Trento (Italy) and was a JILA Fellow at the University of Colorado (USA). His research has been on superfluid He4, superconductivity and theory of ultracold atoms. He has been a short-term visiting professor at the ANU in Canberra (Australia), the Collège de France in Paris, and the University of Otago (New Zealand). Dr Griffin is a Fellow of the Royal Society of Canada (2003), a Fellow of the American Physical Society (2004), and received the Bronze Medal from the Collège de France (2001). He is the author of a monograph on Bose liquids (1993) and the editor of a well-known book on Bose-Einstein condensation (1995), both published by Cambridge University Press.

'This book was a godsend to me! … a subject to which the author has made very substantial contributions … I strongly recommend this book and am very glad to have this book in my library. I am sure that it will be very greatly valued by beginners in the field.' Contemporary Physics

• 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.