Hopf term induced by fermions

Details Hopf term induced by fermions Hopf term induced by fermions

2000-05-16

arxiv.org/abs/hep-th/0005150v2

Phys.Lett. B492 (2000) 321-323

Physics

High Energy Physics

High Energy Physics - Theory

5 pages, no figures, latex, elsart.cls, minor errors are corrected

Scientific paper

10.1016/S0370-2693(00)01118-7

We derive an effective action for Dirac fermions coupled to O(3) non-linear sigma-model (NLSM) through the Yukawa-type interaction. The nonperturbative (global) quantum anomaly of this model results in a Hopf term for the effective NLSM. We obtain this term using the ``embedding'' of the CP$^1$ model into the CP$^M$ generalization of the model which makes the quantum anomaly perturbative. This perturbative anomaly is calculated by means of a gradient expansion of a fermionic determinant and is given by the Chern-Simons term for an auxiliary gauge field.

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