Diabolical critical points are stable higher-codimension defects in parameter space of quantum and classical many-body systems, defined by non-trivial winding of nearby equilibrium states.
Note, however, that for this range ofR,R 2/8<1< R 2/2, and so the operators cosϕ,sinϕare also relevant, while cosmϕ,sinmϕare ir- relevant for allm≥2
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In search of diabolical critical points
Diabolical critical points are stable higher-codimension defects in parameter space of quantum and classical many-body systems, defined by non-trivial winding of nearby equilibrium states.