Integrable sigma models with Haantjes structure on Lie group
arXiv:2605.20851 · doi:10.1016/j.nuclphysb.2026.117491
Abstract
By solving algebraic relations for the conditions of Haantjes structure on a Lie algebra ${\G}$ and by using the corresponding automorphism group we proceed to classify all inequivalent algebraic Haantjes structures on ${\G}$. In this manner, we obtain 34 inequivalent algebraic Haantjes structures on the Lie algebra. We deform the chiral sigma model on a Lie group by using Haantjes structure on it. Then we try to obtain conditions on this structure such that the deformed sigma model remains to be integrable. Finally, using the Haantjes structures and solving this conditions three new integrable sigma models on the Lie group are obtained.
18 pages
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