Complexifying the coupling in nonlinear sigma models yields generic complex-conjugate fixed points with complex scaling dimensions and spiral renormalization-group flows across all tenfold symmetry classes.
Cardy,Scaling and Renormalization in Statistical Physics(Cambridge University Press, Cambridge, Eng- land, 1996)
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Complex nonlinear sigma model
Complexifying the coupling in nonlinear sigma models yields generic complex-conjugate fixed points with complex scaling dimensions and spiral renormalization-group flows across all tenfold symmetry classes.