A bstract
We make a comprehensive study of (rigid) \( \mathcal{N} = {1} \) supersymmetric sigma-models with general Kähler potentials K and superpotentials w on four-dimensional space-times with boundaries. We spell out the minimal (non-supersymmetric) boundary terms one must add to the standard bulk action to make it off-shell invariant under half the supersymmetries without imposing any boundary conditions. Susy boundary conditions do arise from the variational principle when studying the dynamics. Upon including an additional boundary action that depends on an arbitrary real boundary potential B one can generate very general susy boundary conditions. We show that for any set of susy boundary conditions that define a Lagrangian submanifold of the Kähler manifold, an appropriate boundary potential B can be found. Thus the non-linear sigma-model on a manifold with boundary is characterised by the triple (K, B, w). We generalize our results to supersymmetric junctions between completely different susy sigma-models, living on adjacent domains and interacting through a “permeable” wall. We obtain the supersym-metric matching conditions that allow us to couple models with different Kähler potentials and superpotentials on each side of the wall.
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Bilal, A. Supersymmetric boundaries and junctions in four dimensions. J. High Energ. Phys. 2011, 46 (2011). https://doi.org/10.1007/JHEP11(2011)046
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DOI: https://doi.org/10.1007/JHEP11(2011)046