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We consider curves of marginal stability (CMS) in CP(N-1) models in twodimensions with N = (2, 2) supersymmetry. In these theories, one can introducetwisted mass terms. The BPS spectrum has different number of states in the weakand strong coupling regimes. This spectral restructuring can be explained bythe fact that two regimes are separated by CMS on which some BPS states decay.We focus on a special case of Z_N-symmetric twisted masses. In this case, thegeneral solution due to Dorey greatly simplifies, and CMS can be foundexplicitly. For small-$N$ values numerical results are presented. In thelarge-N limit, we find CMS analytically up to ln N /N corrections.Comment: Minor changes, comments and references adde

Curves of marginal stability in two-dimensionalCP(N− 1) models withZN-symmetric twisted masses

Curves of marginal stability in two-dimensionalCP(N− 1) models withZ_N-symmetric twisted masses