Divisorial polystability threshold conjecture

Let (X,Δ)(X,\Delta) be a log Fano manifold with vanishing Futaki character. Define the divisorial polystability threshold δ(X,Δ)ps\delta(X,\Delta)_{\mathrm{ps}} as the infimum of the ratio of averaged log discrepancies to non-Archimedean pluricomplex energy over semistable finite-support probability measures on divisorial valuations. Let γ(N)(X,Δ)G\gamma^{(N)}(X,\Delta)^{\mathcal{G}} and δA(X,Δ)G\delta^{\mathrm{A}}(X,\Delta)^{\mathcal{G}} be the reduced Gibbs and analytic stability thresholds. Divisorial polystability threshold conjecture.

(X,Δ) is K-polystable    δ(X,Δ)ps>1,(X,\Delta)\text{ is K-polystable}\iff\delta(X,\Delta)_{\mathrm{ps}}>1, limNγ(N)(X,Δ)G=δ(X,Δ)ps,\lim_{N\to\infty}\gamma^{(N)}(X,\Delta)^{\mathcal{G}}=\delta(X,\Delta)_{\mathrm{ps}},

and

δA(X,Δ)G=δ(X,Δ)ps.\delta^{\mathrm{A}}(X,\Delta)^{\mathcal{G}}=\delta(X,\Delta)_{\mathrm{ps}}.

When the symmetry group is trivial, the proposed threshold agrees with the standard stability threshold; its validity would imply the earlier log-canonical-threshold stability conjecture. The source provides no resolution.

Sources & referencesView supporting material

Primary source

Rolf Andreasson, Robert J. Berman and Ludvig Svensson, “Gibbs polystability of Fano manifolds, stability thresholds and symmetry breaking”, arXiv:2511.16173 (2026).

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