Double-Scaling Limit in Principal Chiral Model: a New Non-Critical String?

Vladimir Kazakov, Evgeny Sobko, Konstantin Zarembo

We initiate a systematic, non-perturbative study of the large-$N$ expansion in the two-dimensional $\text{SU}(N)\times \text{SU}(N)$ Principal Chiral Model (PCM). Starting with the…