Completeness conjecture for orthogonal orbifold coincidences

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For n≥2n\geq2 and m≥3m\geq3, let Fk(n)\mathcal F_k(n) denote the simple quotient of the symplectic minimal coset family, and let Wℓ(so2m,fprin)Z2\mathcal W_\ell(\mathfrak{so}_{2m},f_{\mathrm{prin}})^{\mathbb Z_2} be the Z2\mathbb Z_2-orbifold of the principal orthogonal W\mathcal W-algebra. Exclude the critical values k=−(n+1)k=-(n+1), k=−n−1/2k=-n-1/2, and ℓ=−(2m−2)\ell=-(2m-2), together with the degenerate cases specified by the source's coincidence theorem. Completeness conjecture. Every remaining isomorphism Fk(n)≅Wℓ(so2m,fprin)Z2\mathcal F_k(n)\cong\mathcal W_\ell(\mathfrak{so}_{2m},f_{\mathrm{prin}})^{\mathbb Z_2} occurs in one of the three explicitly listed parameter families, with m≠n+1m\neq n+1 required in the third family. The first family is stated to be rational whenever n≥m−1n\geq m-1. This is a proposed exhaustive classification conditional on the truncation-curve conjecture; the source gives no resolution evidence.

References

Primary source

Shashank Kanade and Andrew R. Linshaw, “Universal two-parameter even spin W_-algebra”, arXiv:1805.11031 (2019).

Additional references

2 papers in this index state this conjecture (2012–2018). The statement above is taken from the most recent of them; the others are arXiv:1212.5453.

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