Completeness conjecture for the Gaudin model associated with \mathfrak{gl}1∣11|1

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Let gl(1∣1)\mathfrak{gl}(1|1)-weights λ(s)\bm\lambda^{(s)}, 1⩽s⩽k1\leqslant s\leqslant k, be polynomial, let LΛ(b)L_{\bm\Lambda}(\bm b) be the corresponding tensor product representation, and let (LΛ(b))sing(L_{\bm\Lambda}(\bm b))^{\mathrm{sing}} denote its singular subspace. Let φΛ,b\varphi_{\bm\Lambda,\bm b} be the polynomial associated with these weights and evaluation parameters, and let H(x)\mathscr H(x) be the Gaudin transfer matrix.

Completeness conjecture. The operator H(x)\mathscr H(x) has simple spectrum on (LΛ(b))sing(L_{\bm\Lambda}(\bm b))^{\mathrm{sing}}. There is a bijection between the monic divisors yy of φΛ,b\varphi_{\bm\Lambda,\bm b} and the eigenvectors vv of the Gaudin transfer matrices, up to multiplication by a non-zero constant, such that

H(x)v=Ey,Λ,b(x)v,\mathscr H(x)v=\mathcal E_{y,\bm\Lambda,\bm b}(x)v,

where Ey,Λ,b(x)\mathcal E_{y,\bm\Lambda,\bm b}(x) is the eigenvalue defined by the Bethe-ansatz formula in the source.

This is the completeness statement for the Bethe ansatz: every relevant eigenvector is parametrized by a monic divisor of φΛ,b\varphi_{\bm\Lambda,\bm b}, and distinct divisors yield the simple spectrum. The parser provides no resolution evidence, so the conjecture is recorded as open.

References

Primary source

Kang Lu, “Completeness of Bethe ansatz for Gaudin models associated with gl(1|1)”, arXiv:2202.08162 (2022).

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