MRC-fibration conjecture for pseudoeffective differential forms

Let XX be a uniruled projective manifold, let f:X\dasharrowZf:X\dasharrow Z be its MRC fibration, and assume that ZZ is a projective manifold. Set n=dimXn=\dim X, and let 1qn1\leq q\leq n. The sheaves of holomorphic differential forms in degree qq on XX and ZZ are denoted by ΩXq\Omega^q_X and ΩZq\Omega^q_Z, respectively.

MRC-fibration pseudoeffectivity conjecture. One has

ΩXq is pseudoeffectiveΩZq is pseudoeffective.\Omega^q_X\text{ is pseudoeffective}\quad\Longleftrightarrow\quad\Omega^q_Z\text{ is pseudoeffective}.

This proposes that, for a uniruled manifold, pseudoeffectivity of differential forms is detected on the base of the maximal rationally connected fibration. The preceding results establish related implications and the converse in certain degree ranges, but the full equivalence remains open in the supplied text.

Sources & referencesView supporting material

Primary source

Andreas Höring and Thomas Peternell, “A Nonvanishing Conjecture for Cotangent Bundles”, arXiv:2006.05225 (2020).

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