Adjoint positivity and embedding conjecture for weakly pseudoconvex complex spaces

Let XX be a non-compact weakly pseudoconvex complex space of pure dimension nn, let π:X~X\pi:\widetilde{X}\longrightarrow X be a canonical desingularization, and let LXL\longrightarrow X be a holomorphic line bundle. Assume that LL is positive. Write ωXGR=πωX~\omega_X^{GR}=\pi_*\omega_{\widetilde{X}} for the Grauert–Riemenschneider canonical sheaf. Adjoint positivity and embedding conjecture.

(a) Does there exist an integer mn(n+1)/2m\geq n(n+1)/2 such that

KX~πLmK_{\widetilde{X}}\otimes\pi^*L^{\otimes m}

is semi-ample?

(b) Does there exist an integer mn(n+1)/2m\geq n(n+1)/2 such that

ωXGRLm\omega_X^{GR}\otimes L^{\otimes m}

is ample? Furthermore, is

(ωXGRLm)(n+2)(\omega_X^{GR}\otimes L^{\otimes m})^{\otimes(n+2)}

very ample, so that the linear system

(ωXGRLm)(n+2)|(\omega_X^{GR}\otimes L^{\otimes m})^{\otimes(n+2)}|

gives a holomorphic embedding of XX into P2n+1\mathbb{P}^{2n+1}? This extends the corresponding embedding theorem for smooth non-compact weakly pseudoconvex manifolds to singular complex spaces; the semi-ampleness, ampleness, and embedding assertions remain open in the stated generality.

Sources & referencesView supporting material

Primary source

Yuta Watanabe, “Global embeddings of weakly pseudoconvex complex spaces and refined Runge-type approximation theorems”, arXiv:2512.03572 (2026).

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