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arxiv: 1310.8566 · v1 · pith:DKLAQDGOnew · submitted 2013-10-31 · 🧮 math.OA · math.QA

1-supertransitive subfactors with index at most 6+1/5

classification 🧮 math.OA math.QA
keywords indexsubfactorssqrtexactlyachievedalreadyappearapprox
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We classify irreducible II_1 subfactors A \subset B such that B \ominus A is reducible as an A-A bimodule, with index at most 6+1/5, leaving aside the composite subfactors at index exactly 6. Previous work has already achieved this up to index 3+\sqrt{5} \approx 5.23. We find there are exactly three such subfactors with index in (3+\sqrt{5}, 6+1/5], all with index 3+2\sqrt{2}. One of these comes from SO(3)_q at a root of unity, while the other two appear to be closely related, and are `braided up to a sign'.

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