Glueballs in 3-dimensional PQED with and without dynamical fermions

Measurements are presented of the glueball spectrum in 3D compact electrodynamics with and without dynamical fermions. The expected weak coupling behaviour of the pure gauge theory is observed on a 123 lattice for β>1.5. In the coupling range studied the predominant effect of dynamical fermions is accounted for by a shift of order 0.15 relative to the pure gauge theory or, equivalently, by a mass reduction of order 25% at fixed coupling. The dependence on fermion mass is apparently weak for bare masses below 0.2. (orig.)