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- W1995654715 abstract "Two-dimensional ${mathrm{CP}}^{Nensuremath{-}1}$ models are analyzed by means of the $frac{1}{N}$ expansion, performed up to the first nonleading order. The expectation values of gauge- and renormalization-group-invariant quantities are computed in a regulated continuum version of the theory: renormalizability and absence of infrared divergences are explicitly verified. Special attention is devoted to open and closed loops of gauge fields and to their correlations. No single-particle mass for the elementary gauge-dependent fields can be consistently defined. The observable mass parameter is related to the lowest-energy bound state and shows a nonanalytic dependence on $frac{1}{N}$. The qualitative picture of the ${mathrm{CP}}^{Nensuremath{-}1}$ models resulting from the large-$N$ approximation is quantitatively confirmed in the $frac{1}{N}$ expansion." @default.
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- W1995654715 date "1992-01-15" @default.
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- W1995654715 title "CPN−1models in the1Nexpansion" @default.
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- W1995654715 doi "https://doi.org/10.1103/physrevd.45.618" @default.
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