Higher Theta-stratification conjecture for equivariant Fano fibrations

Consider TT-equivariant Fano fibrations π ⁣:X→Y\pi\colon X\to Y, fixing the multi-Hilbert function of T↷YT\curvearrowright Y and the Hilbert polynomial of −KX-K_X on the fibers of π\pi. Higher Theta-stratification conjecture. There is a sufficiently large parameter scheme H↶GH\curvearrowleft G of TT-equivariant Fano fibrations, with GG preserving isomorphism classes, such that the weighted volume W(−)\mathbb{W}(-) is lower semicontinuous and induces a higher Θ\Theta-stratification with finitely many strata {Zc:={W(−)=c}}c\{\mathcal{Z}_c:=\{\mathbb{W}(-)=c\}\}_c on [H/G][H/G], encoding the generalized test configurations familywise as Zc×[Uσ/T]→Zc\mathcal{Z}_c\times[U_\sigma/T]\to\mathcal{Z}_c. This is proposed as a moduli-theoretic structure extending the parameter-space construction and incorporating generalized test configurations; the source gives no resolution.

References

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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