Campana–Peternell reformulation for algebraic fiber spaces with Kodaira dimension zero fibers

Let f:XYf:X\to Y be an algebraic fiber space between smooth projective varieties, and suppose that the general fiber FF satisfies κ(F)=0\kappa(F)=0. Let HH be an ample divisor on YY. Campana–Peternell reformulation. If m0KXfHm_0K_X-f^*H is pseudo-effective for some m01m_0\geq 1, then κ(X)=dimY\kappa(X)=\dim Y. The paper presents this as an equivalent formulation under the non-vanishing conjecture, but the supplied text does not establish its resolution status.

Sources & referencesView supporting material

Primary source

Yongpan Zou, “On the Kodaira dimension of some algebraic fiber spaces”, arXiv:2409.19981 (2025).

Additional references

31 papers in this index state this conjecture (2007–2024). The statement above is taken from the most recent of them; the others are arXiv:2409.07264, arXiv:2408.03799, arXiv:2405.05582, arXiv:2402.16049, arXiv:2310.14131, arXiv:2211.03469, arXiv:2204.12828, arXiv:2202.01295, arXiv:2202.02825, arXiv:2202.11563, arXiv:2112.12412, arXiv:2111.05234, and 18 more.

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