BPS domain walls in large-N supersymmetric QCD

We explicitly construct BPS domain wails interpolating between neighboring chirally asymmetric vacua in a model for large-N pure supersymmetric QCD, The BPS equations for the corresponding Z(N) symmetric order parameter effective Lagrangian reduce to those in the A(N) Landau-Ginsburg model assuming that the higher derivative terms in the Kahler potential are suppressed in the large-N limit. These BPS domain wails, which have vanishing width in the large-N limit, can be viewed as supermembranes embedded in a (3 + I)-dimensional supersymmetric QCD background. The supermembrane couples to a three-form supermultiplet whose components Lye identify with the composite fields of supersymmetric QCD, We also discuss certain aspects of chromoelectric flux tubes (open strings) ending: on these walls which appear to support their interpretation as D-branes, (C) 1999 Elsevier Science B.V. All rights reserved.