The SYZ mirror-resolution conjecture for Spin(7) orbifolds

Let (X^,Φ^)(\widehat{X},\widehat{\Phi}) be an SYZ-fibred Spin(7)\operatorname{Spin}(7)-manifold, let τ\tau be fibrewise multiplication by 1-1, and let SS be the compact four-manifold base. Assume there exists a nonvanishing harmonic self-dual two-form ζΩ+2(S)\zeta\in\Omega^2_+(S) and a resolving family

ρζ;t:(Xζ;t,Φζ;t)(X,Φ)/τ.\rho_{\zeta;t}:(X_{\zeta;t},\Phi_{\zeta;t})\dashrightarrow(X,\Phi)/\tau.

Let (X,Φ)(\overline{X},\overline{\Phi}) be the SYZ mirror and τ\overline{\tau} its induced involution. The SYZ mirror-resolution conjecture. The quotient (X,Φ)/τ(\overline{X},\overline{\Phi})/\overline{\tau} admits a resolving family

ρζ;t:(Xζ;t,Φζ;t)(X,Φ)/τ,\rho_{\zeta^*;t}:(\overline{X}_{\zeta^*;t},\overline{\Phi}_{\zeta^*;t})\dashrightarrow(\overline{X},\overline{\Phi})/\overline{\tau},

and (Xζ;t,Φζ;t)(X_{\zeta;t},\Phi_{\zeta;t}) and (Xζ;t,Φζ;t)(\overline{X}_{\zeta^*;t},\overline{\Phi}_{\zeta^*;t}) are mirror dual. This is a proposed compatibility between Spin(7) orbifold resolutions and SYZ mirror symmetry; the source gives no proof.

Sources & referencesView supporting material

Primary source

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

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