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

Let φ:XY\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=φAL=\varphi^*A. For a movable class α\alpha on XX satisfying Lkα=0L^k\cdot\alpha=0, pullback description conjecture. There should exist compact Kähler manifolds XX' and YY', bimeromorphic holomorphic maps π:XX\pi:X'\rightarrow X and μ:YY\mu:Y'\rightarrow Y, a holomorphic map φ:XY\varphi':X'\rightarrow Y', and a pseudoeffective class β\beta on YY' such that

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

and

α=πφβ.\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.

Sources & referencesView supporting material

Primary source

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

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.