Pullback description conjecture for movable classes annihilated by a semiample-type class

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Let φ:X→Y\varphi:X\rightarrow Y be a surjective holomorphic map between compact Kähler manifolds of dimensions nn and kk, respectively, and let AA be a Kähler class on YY. Set L=φ∗AL=\varphi^*A. For a movable class α\alpha on XX satisfying Lk⋅α=0L^k\cdot\alpha=0, pullback description conjecture. There should exist compact Kähler manifolds X′X' and Y′Y', bimeromorphic holomorphic maps π:X′→X\pi:X'\rightarrow X and μ:Y′→Y\mu:Y'\rightarrow Y, a holomorphic map φ′:X′→Y′\varphi':X'\rightarrow Y', and a pseudoeffective class β\beta on Y′Y' such that

\begin{tikzcd} X' \arrow{r}{\pi} \arrow{d}{\varphi'} & X \arrow{d}{\varphi} \\ Y' \arrow{r}{\mu}& Y \end{tikzcd}

and

α=π∗⟨φ′∗β⟩.\alpha=\pi_*\langle\varphi'^*\beta\rangle.

This asks whether the geometric description known in the semiample projective setting extends to the transcendental Kähler setting; the source presents it as a natural question and leaves it open.

References

Primary source

Jiajun Hu and Jian Xiao, “Positivity in the shadow of Hodge index theorem”, arXiv:2505.06626 (2025).

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