Effective Field Theory for Goldstone Bosons in Nonrelativistic Superfluids

Details Effective Field Theory for Goldstone Bosons in Nonrelativistic Superfluids Effective Field Theory for Goldstone Bosons in Nonrelativistic Superfluids

2002-09-10

arxiv.org/abs/cond-mat/0209243v1

Physics

Condensed Matter

4 pages, 1 figure, revtex

Scientific paper

We consider nonrelativistic superfluids where the global U(1)-symmetry is spontaneously broken. At sufficiently long wavelengths, the relevant degree of freedom is the massless Goldstone mode and we construct an effective low energy theory for the Goldstone boson. The damping rate of collective excitations at low energy is calculated. In the case of a weakly interacting Bose gas, we recover the results by Beliaev, and by Hohenberg and Martin.

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