General existence conjecture for higher Theta-stratifications of Fano-fibration moduli

Let Mo\mathcal{M}^o be a finite-type algebraic \mathbbmk\mathbbm{k}-stack underlying a Q\mathbb{Q}-Gorenstein faithfully flat affine family of Q\mathbb{Q}-Fano fibrations, equipped with a section of the base morphism. General higher Θ\Theta-stratification conjecture. There is a monomorphism MoM\mathcal{M}^o\to\mathcal{M} into another finite-type quotient algebraic \mathbbmk\mathbbm{k}-stack carrying an extending Q\mathbb{Q}-Gorenstein family of Q\mathbb{Q}-Fano fibrations and a higher Θ\Theta-stratification defined by the lower semicontinuous, constructible weighted-volume function, with finitely many strata {Zc:={W()=c}}cR\{\mathcal{Z}_c:=\{\mathbb{W}(-)=c\}\}_{c\in\mathbb{R}} encoding the generalized test configurations familywise as Zc×[Uσ/T]Zc\mathcal{Z}_c\times[U_\sigma/T]\to\mathcal{Z}_c. This is a proposed generalization of the preceding parameter-space conjecture toward moduli and properness; the source gives no resolution.

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Primary source

Yuji Odaka, “On Sun-Zhang's theory of Fano fibrations – weighted volumes, moduli and bubbling Fano fibrations”, arXiv:2506.14671 (2025).

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