Local BRST cohomology of the gauged principal non-linear sigma model

Details Local BRST cohomology of the gauged principal non-linear sigma model Local BRST cohomology of the gauged principal non-linear sigma model

1998-02-17

arxiv.org/abs/hep-th/9802118v3

Phys.Rev. D58 (1998) 025017

Physics

High Energy Physics

High Energy Physics - Theory

no figures, some references added, typos corrected

Scientific paper

10.1103/PhysRevD.58.025017

The local BRST cohomology of the gauged non-linear sigma model on a group manifold is worked out for any Lie group G. We consider both, the case where the gauge field is dynamical and the case where it has no kinetic term (G/G topological theory). Our results shed a novel light on the problem of gauging the WZW term as well as on the nature of the topological terms introduced a few years ago by De Wit, Hull and Rocek. We also consider the BRST cohomology of the rigid symmetries of the ungauged model and recover the results of D'Hoker and Weinberg on the most general effective actions compatible with the symmetries.

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