Nonrelativistic effective Lagrangians

H. Leutwyler
Phys. Rev. D 49, 3033 – Published 15 March 1994
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Abstract

Chiral perturbation theory is extended to nonrelativistic systems with spontaneously broken symmetry. In the effective Lagrangian, order parameters associated with the generators of the group manifest themselves as effective coupling constants of a topological term, which is gauge invariant only up to a total derivative. In the case of the ferromagnet, a term connected with the Brouwer degree dominates the derivative expansion. The general analysis includes antiferromagnetic magnons and phonons, while the effective field theory of fluids or gases is beyond the scope of the method.

  • Received 10 September 1993

DOI:https://doi.org/10.1103/PhysRevD.49.3033

©1994 American Physical Society

Authors & Affiliations

H. Leutwyler

  • Institut für Theoretische Physik der Universität Bern, Sidlerstr. 5, CH-3012 Bern, Switzerland

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Vol. 49, Iss. 6 — 15 March 1994

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