2002/09/10 by Jens O. Andersen, Andersen, Jens O.
Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #Condensed Matter (cond-mat) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Quantum, superfluid, helium dynamics #cond-mat #hep-ph
paper · pdf · doi:10.48550/arxiv.cond-mat/0209243
4 pages, 1 figure, revtex
arxiv created 2002/09/10 · openalex publication_date 2002/09/10 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We consider nonrelativistic superfluids where the global U(1)-symmetry is\nspontaneously broken. At sufficiently long wavelengths, the relevant degree of\nfreedom is the massless Goldstone mode and we construct an effective low energy\ntheory for the Goldstone boson. The damping rate of collective excitations at\nlow energy is calculated. In the case of a weakly interacting Bose gas, we\nrecover the results by Beliaev, and by Hohenberg and Martin.\n