Bags, junctions, and networks of BPS and non-BPS defects - art. no. 105019

We investigate several models of coupled scalar fields that present discret e Z(2), Z(2) x Z(2), Z(3) and other symmetries. These models support topolo gical domain wall solutions of the BPS and non-BPS type. The BPS solutions are stable, but the stability of the non-BPS solutions may depend on the pa rameters that specify the models. The BPS and non-BPS states give rise to b ags, and also to three-junctions that may allow the presence of networks of topological defects. In particular, we show that the non-BPS defects of a specific model that engenders the Z(3) symmetry give rise to a stable regul ar hexagonal network of domain walls.