Color-flavor reflection in the continuum limit of two-dimensional lattice gauge theories with scalar fields

Abstract

We address the interplay between local and global symmetries in determining the continuum limit of two-dimensional lattice scalar theories characterized by $SO(N_c)$ gauge symmetry and non-Abelian $O(N_f)$ global invariance. We argue that, when a quartic interaction is present, the continuum limit of these model corresponds in some cases to the gauged non-linear $\sigma$ model field theory associated with the real Grassmannian manifold $SO(N_f)/(SO(N_c)\times SO(N_f-N_c)$), which is characterized by the invariance under the color-flavor reflection $N_c\leftrightarrow N_f-N_c$. Monte Carlo simulations and Finite-Size Scaling analyses, performed for $N_f=7$ and several values of $N_c$, confirm the emergence of the color-flavor reflection symmetry in the scaling limit, and support the identification of the continuum limit.

arXiv comment9 pages, 8 pdf figures

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