Converse conjecture to the dHYM stability inequalities for Kähler threefolds

Let (X,ω)(X,\omega) be a Kähler threefold and let LXL\rightarrow X be a holomorphic line bundle. Suppose that the Chern number inequality holds, the lifted angle is well-defined with θ^(π,3π2)\hat{\theta}\in(\pi,\frac{3\pi}{2}), ZX(L)Z_X(L) lies in the upper half-plane, and for every irreducible analytic subset VXV\subset X one has ZV(L)Z_V(L) in the upper half-plane and φV(L)>φX(L)\varphi_V(L)>\varphi_X(L). C.-Yau converse conjecture. The converse of the stated proposition holds: these numerical and slicing-angle conditions imply that LL admits a solution of the deformed Hermitian–Yang–Mills equation with lifted angle θ^(π,3π2)\hat{\theta}\in(\pi,\frac{3\pi}{2}). The source notes that the small-radius-limit case for ample line bundles on toric varieties, and later the corresponding result without the toric assumption, had been proved; the general converse was presented as the remaining conjectural statement.

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Primary source

Tristan C. Collins and Yun Shi, “Stability and the deformed Hermitian-Yang-Mills equation”, arXiv:2004.04831 (2022).

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