Large-N Principal Chiral Model in Arbitrary External Fields

Phys Rev Lett. 2024 Apr 5;132(14):141602. doi: 10.1103/PhysRevLett.132.141602.

Abstract

We report the explicit solution for the vacuum state of the two-dimensional SU(N) principal chiral model at large N for an arbitrary set of chemical potentials and any interaction strength, a unique result of such kind for an asymptotically free quantum field theory. The solution matches one-loop perturbative calculation at weak coupling, and in the opposite strong-coupling regime exhibits an emergent spacial dimension from the continuum limit of the SU(N) Dynkin diagram.