1993/11/11 by H. Leutwyler · 2 citations
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1006/aphy.1994.1094
published as Annals Phys. 235 (1994) 165-203 · 52 pages, BUTP-93/24
arxiv created 1993/11/11 · arxiv updated 2009/11/30
The properties of the effective field theory relevant for the low energy structure generated by the Goldstone bosons of a spontaneously broken symmetry are reexamined. It is shown that anomaly free, Lorentz invariant theories are characterized by a gauge invariant effective Lagrangian, to all orders of the low energy expansion. The paper includes a discussion of anomalies and approximate symmetries, but does not cover nonrelativistic effective theories.