Systematic compactification of the two-channel Kondo model. II. Comparative study of scaling and universality

Following up on the systematic compactification of the two-channel Kondo model and its multichannel extensions; see Ljepoja et al., Phys. Rev. B 110, 045108 (2024) and the demonstration of its validity over the past proposal of compactification, we resort to a study of scaling using Anderson's simple poor man's procedure to carry out a comparative study of these two and the original model. By doing so we unveil a universal agreement among the three models in how they flow upon scaling, and suggest the general limits of such a concordance. In this way we further elucidate the conditions under which the standard simplifications implicit in many bosonization-based mappings (particularly of quantum impurity models) can be used reliably, and when the consistent bosonization-debosonization approach is needed.