Yau's conjecture on the Strominger system through conifold transitions

Let chatXchat{X} be a Calabi–Yau threefold, and let

X^X0Xt\hat{X} \rightarrow X_0 \rightsquigarrow X_t

be a conifold transition. Let (Ωt,ωt,ht)(\Omega_t,\omega_t,h_t) denote the holomorphic volume form, Hermitian form, and bundle metric involved in the Strominger system, and let FhtF_{h_t} and RωtR_{\omega_t} be the corresponding curvatures. Yau's conjecture. For small enough tt, there exists a triple (Ωt,ωt,ht)(\Omega_t,\omega_t,h_t) solving the supersymmetry equations

,,,\quad,\quad

and the heterotic Bianchi identity

iˉωt=αt(Tr(FhtFht)Tr(RωtRωt)),i \partial \bar{\partial} \omega_t = \alpha'_t \bigl(\operatorname{Tr}(F_{h_t} \wedge F_{h_t})-\operatorname{Tr}(R_{\omega_t} \wedge R_{\omega_t})\bigr),

where RωR_\omega is the Chern curvature of ω\omega and αt>0\alpha'_t>0. This is the conjectural completion of the authors' construction of solutions to the supersymmetry equations through conifold transitions; the additional Bianchi identity is required for the heterotic string equations and had not yet been solved through conifold transitions in the source.

Sources & referencesView supporting material

Primary source

Sébastien Picard, “Calabi-Yau threefolds across quadratic singularities”, arXiv:2501.19313 (2025).

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