I discuss various situations in which perturbative expansions are used in Yang–Mills theories with asymptotic freedom and establish the limits of its applicability.
Bibliographical noteFunding Information:
I am grateful to Daniel Schubring, Chao-Hsiang Sheu, and M. Ünsal for very useful discussions. This work is supported in part by DOE Grant de-sc0011842.
© 2021, The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature.