Effective field theory approach to Bose--Einstein condensation

Details Effective field theory approach to Bose--Einstein condensation Effective field theory approach to Bose--Einstein condensation

1997-11-24

arxiv.org/abs/cond-mat/9711250v4

Int. J. Mod. Phys. B 12 (1998) 2103

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 1 figure included. An invited article for Int. J. Mod. Phys. B. This revised version adds some discussions relevant

Scientific paper

10.1142/S0217979298001241

We consider the low-energy collective excitations at finite temperature of Bose--Einstein condensed gases (and liquids as well). A most general model-independent effective Lagrangian is written down according to a prescription obtained from the breakdown of the global symmetry U(1). To show how the theory predicts easily, we derive the momentum and temperature dependence of the damping of excitations by means of power counting as an example.

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