Effective field theory approach to Bose--Einstein condensation

Abstract

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.

12 pages, 1 figure included. An invited article for Int. J. Mod. Phys. B. This revised version adds some discussions relevant to Bose-Einstein condensates in a harmonic trap

References in corpus (2)

• Landau damping in dilute Bose gases
• A theoretical study on the damping of collective excitations in a Bose-Einstein condensate

Cited by in corpus (4)

• Theory of the Weakly Interacting Bose Gas
• Effective field theory and dispersion law of the phonons of a non-relativistic superfluid
• Application of the functional renormalization group to Bose gases: from linear to hydrodynamic fluctuations
• Intercomponent entanglement entropy and spectrum in binary Bose-Einstein condensates