= Complex sine-Gordon theory
{title2=$\mathcal L=|\partial\psi|^2/(1-\lambda^2|\psi|^2)-M^2|\psi|^2$}
= Complex sine-Gordon model
{synonym}
A nonlinear <complex scalar field> theory with a global phase symmetry and a curved target-space kinetic coefficient. In physical coordinates its classical density is displayed above; dimensionless coordinates measured in $M^{-1}$ put a common $M^2$ outside the reduced density. Its regular coordinate domain is $\lambda^2|\psi|^2<1$. Rotating localized solutions are <charged complex sine-Gordon solitons>. The local classical density does not by itself specify the treatment of the singular coordinate boundary or a global quantum completion.
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