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- W45810490 abstract "The role of instantons in the breakdown of chiral U(N) symmetry is studied in a two dimensional model. Chiral U(1) is always destroyed by the axial vector anomaly. For N = 2 chiral SU(N) is also spontaneously broken yielding massive fermions and three (decoupled) Goldstone bosons. For N greater than or equal to 3 the fermions remain massless. Realistic four dimensional theories are believed to behave in a similar way but the critical N above which the fermions cease to be massive is not known in four dimensions." @default.
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- W45810490 date "1977-05-01" @default.
- W45810490 modified "2023-10-16" @default.
- W45810490 title "Instantons and massless fermions in two dimensions" @default.
- W45810490 doi "https://doi.org/10.2172/7284867" @default.
- W45810490 hasPublicationYear "1977" @default.
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