The universal Calabi–Yau ALE structure conjecture

Let κ:M→ΘIm⁡(C)\kappa:\mathbb{M}\to\Theta_{\operatorname{Im}(\mathbb{C})} be the universal Kähler ALE bundle, with vertical forms ωM;RF\omega_{\mathbb{M};RF} and Re⁡(θM;RF)\operatorname{Re}(\theta_{\mathbb{M};RF}), Im⁡(θM;RF)\operatorname{Im}(\theta_{\mathbb{M};RF}). The universal Calabi–Yau ALE structure conjecture. There exist ΛM;RF⊕ΞM;RF∈Ω0,2⊕Ω0,(n,0)(M,z)\Lambda_{\mathbb{M};RF}\oplus\Xi_{\mathbb{M};RF}\in\Omega^{0,2}\oplus\Omega^{0,(n,0)}(\mathbb{M},\mathfrak{z}) satisfying the displayed differential identities and the condition ΛM;RF∧ωM;RF=0\Lambda_{\mathbb{M};RF}\wedge\omega_{\mathbb{M};RF}=0:

d⁡ωM;RF=d⁡0,1ωM;RF=⟨κ∗θΘIm⁡(C)∧ΛM;RF⟩,\operatorname{d}\omega_{\mathbb{M};RF}=\operatorname{d}^{0,1}\omega_{\mathbb{M};RF}=\left\langle\kappa^*\theta_{\Theta_{\operatorname{Im}(\mathbb{C})}}\wedge\Lambda_{\mathbb{M};RF}\right\rangle, d⁡Re⁡(θM;RF)=d⁡1,0Re⁡(θM;RF)=⟨κ∗θΘIm⁡(C)∧Re⁡(ΞM;RF)⟩,\operatorname{d}\operatorname{Re}(\theta_{\mathbb{M};RF})=\operatorname{d}^{1,0}\operatorname{Re}(\theta_{\mathbb{M};RF})=\left\langle\kappa^*\theta_{\Theta_{\operatorname{Im}(\mathbb{C})}}\wedge\operatorname{Re}(\Xi_{\mathbb{M};RF})\right\rangle, d⁡Im⁡(θM;RF)=d⁡1,0Im⁡(θM;RF)=⟨κ∗θΘIm⁡(C)∧Im⁡(ΞM;RF)⟩.\operatorname{d}\operatorname{Im}(\theta_{\mathbb{M};RF})=\operatorname{d}^{1,0}\operatorname{Im}(\theta_{\mathbb{M};RF})=\left\langle\kappa^*\theta_{\Theta_{\operatorname{Im}(\mathbb{C})}}\wedge\operatorname{Im}(\Xi_{\mathbb{M};RF})\right\rangle.

These identities are intended to organise the Ricci-flat Calabi–Yau structures into a family over the parameter space; the source supplies no proof.

References

Primary source

Viktor F. Majewski, “Spin(7)-Orbifold Resolutions”, arXiv:2509.16057 (2026).

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