Phys. Rev. D 50, R6050–R6053 (1994)General effective actions
We investigate the structure of the most general actions with the symmetry group G, spontaneously broken down to a subgroup H. We show that the only possible terms in the Lagrangian density that, although not G invariant, yield G-invariant terms in the action, are in one to one correspondence with the generators of the fifth cohomology classes. For the special case of G=SU(N)L×SU(N)R broken down to the diagonal subgroup H=SU(N)V, there is just one such term for N≥3, which for N=3 is the original Wess-Zumino-Witten term. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.50.R6050
DOI:
10.1103/PhysRevD.50.R6050
PACS:
11.10.Ef, 11.30.Qc
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