Integrable Spin Chains from large-$N$ QCD at strong coupling

Abstract

We study a spin chain for a confining string that arises at first order in degenerate perturbation from the strong-coupling expansion of the Kogut-Susskind Hamiltonian on a square lattice in the leading large $N$ expansion. We show some subsectors are integrable and that with a relaxed constraint related to zigzag symmetry, the full spin chain is integrable in arbitrary dimensions.

Comments: 5 pages, 5 figures. v2: updated references, minor edits