Abstract
The two-dimensional supersymmetric CP(N - 1) model has a striking similarity to the supersymmetric gauge theory in four dimensions. The BPS mass formula and the curve of the marginal stability (CMS), which exist in the four-dimensional gauge theory, appear in this two-dimensional CP(N - 1) model. These two quantities are derived by a one-dimensional n-vector spin model in the large n limit for the N = 2 case. This mapping is further investigated at the critical point. An application of the study of the BPS mass formula is proposed to the phenomena of the spin and charge separations in the Higgs phase.
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