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The Non-Linear Sigma-Model (NLSM) is a field theory whose field takes its values in a Riemannian manifold M. The NLSM field values can therefore be considered as a set of coordinates in the internal manifold M whose metric is field-dependent. The NLSM format is thus the very general field-theoretical concept whose apparent geometrical meaning is the main reason for many successful applications of NLSM in field theory, string theory and statistical mechanics.
KeywordsGauge Theory Conformal Field Theory Asymptotically Locally Euclidean Quantum Einstein Gravity Deep Inelastic Scatter
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