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We study quantum effects due to a Dirac field in 2+1 dimensions, confined toa spatial region with a non-trivial boundary, and minimally coupled to anAbelian gauge field. To that end, we apply a path-integral representation,which is applied to the evaluation of the Casimir energy and to the study ofthe contribution of the boundary modes to the effective action when an externalgauge field is present. We also implement a large-mass expansion, derivingresults which are, in principle, valid for any geometry. We compare them withtheir counterparts obtained from the large-mass `bosonized' effective theory.Comment: 15 pages, 1 figur

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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Effective action forQED3in a region with borders