Resurgence and semiclassical expansion in two-dimensional large-$N$ sigma models

Hiromichi Nishimura, Toshiaki Fujimori, Tatsuhiro Misumi +2

The resurgence structure of the 2d $O(N)$ sigma model at large $N$ is studied with a focus on an IR momentum cutoff scale $a$ that regularizes IR singularities in the semiclassical…