Collins–Jacob–Yau's stability conjecture for the dHYM equation

Let (X,ω)(X,\omega) be a compact Kähler manifold of complex dimension nn, let αC=α+iβ\alpha^{\mathbb{C}}=\alpha+\mathrm{i}\beta be a complexified Kähler class, and let ϑ^\hat{\vartheta} be its phase. Assume that the (1,1)(1,1)-class β\beta has supercritical phase. For a proper irreducible analytic subvariety VXV\subset X of dimension pp, write ιV:VX\iota_V:V\hookrightarrow X for the inclusion. Collins–Jacob–Yau's stability conjecture. There is a solution BβB\in\beta of the dHYM equation if and only if, for every proper irreducible analytic subvariety VXV\subset X with 1p<n1\leq p<n,

Im(eiϑ^(ιVαC)p)<0.\operatorname{Im}\left(\mathrm{e}^{-\mathrm{i}\hat{\vartheta}}(\iota_V^*\alpha^{\mathbb{C}})^p\right)<0.

This conjecture proposes a numerical criterion for solvability of the deformed Hermitian Yang–Mills equation, analogous to stability criteria in the setting of the Calabi conjecture and related geometric PDEs. Its general status is not established in the supplied source.

Sources & referencesView supporting material

Primary source

Carlo Scarpa, “A K-energy functional for complexified Kähler classes”, arXiv:2307.09904 (2026).

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