Sigma model

In physics, a sigma model is a physical system that is described by a Lagrangian density of the form:

Depending on the scalars in $g ij$ , it is either a linear sigma model or a non-linear sigma model. The fields $φ i$ , in general, provide a map from a base manifold called the worldsheet to a target (Riemannian) manifold of the scalars linked together by internal symmetries. (In string theory, however, that is often understood to be the actual spacetime.)

单词	Sigma model
释义	Sigma model 英语百科 Sigma model In physics, a sigma model is a physical system that is described by a Lagrangian density of the form: Depending on the scalars in $g ij$ , it is either a linear sigma model or a non-linear sigma model. The fields $φ i$ , in general, provide a map from a base manifold called the worldsheet to a target (Riemannian) manifold of the scalars linked together by internal symmetries. (In string theory, however, that is often understood to be the actual spacetime.)
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