2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51595The ${\cal N}=1$ SUSY nonlinear sigma models in four spacetime dimensions are studied to obtain BPS walls and junctions. A nonlinear sigma model with a single chiral scalar superfield is found which has a moduli space of the topology of $S^1$ and admits BPS walls and junctions connecting arbitrary points in moduli space. New BPS junction solutions connecting $N$ discrete vacua are also found for nonlinear sigma models with several chiral scalar superfields. More detailed exposition of our results can be found in Ref.\cite{NNS}.Talk at the third international Sakharov conference on Physics, 24-29 June 2002, to appear in the Proceedings, references addedHigh Energy Physics - Theorytext