On the gauge and BRST invariance of the chiral QED with Faddeevian anomaly

TL;DR

This paper investigates the gauge and BRST invariance of the chiral QED with Faddeevian anomaly, demonstrating systematic quantization, gauge invariance without phase space extension, and connections to the vector Schwinger model.

Contribution

It provides a systematic BRST quantization of the anomalous chiral Schwinger model and constructs a gauge invariant reformulation without phase space extension.

Findings

Systematic BRST quantization of the model.

Automatic emergence of Wess-Zumino term during quantization.

Gauge invariant reformulation maps onto the vector Schwinger model.

Abstract

Chiral Schwinger model with the Faddeevian anomaly is considered. It is found that imposing a chiral constraint this model can be expressed in terms of chiral boson. The model when expressed in terms of chiral boson remains anomalous and the Gauss law of which gives anomalous Poisson brackets between itself. In spite of that a systematic BRST quantization is possible. The Wess-Zumino term corresponding to this theory appears automatically during the process of quantization. A gauge invariant reformulation of this model is also constructed. Unlike the former one gauge invariance is done here without any extension of phase space. This gauge invariant version maps onto the vector Schwinger model.The gauge invariant version of the chiral Schwinger model for $a=2$ has a massive field with identical mass however gauge invariant version obtained here does not map on to that.