Independence of optimal degenerations from the weighting function

From papers

Let (X,Δ)(X,\Delta) be a log Fano pair and let g,gˉg,\bar{g} be functions satisfying the conditions in the source. Let (Y,ΔY,ξ0)(Y,\Delta_Y,\xi_0) and (Y,ΔY,ξˉ0)(\overline{Y},\Delta_{\overline{Y}},\bar{\xi}_0) be the gg- and gˉ\bar{g}-optimal degenerations of (X,Δ)(X,\Delta), respectively. Independence conjecture. The underlying log Fano pairs are isomorphic:

(Y,ΔY)(Y,ΔY).(Y,\Delta_Y)\cong(\overline{Y},\Delta_{\overline{Y}}).

If true, this would show that the optimal degeneration of a log Fano pair is independent of the choice of admissible weighting function, even though the associated valuations, Reeb vectors, and weighted K-stability notions may vary. The conjecture is presented as an open question in the source; the precise hypotheses encoded by the referenced condition on gg should be checked.

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Sources & referencesView supporting material

Primary source

Linsheng Wang, “Generalized optimal degenerations of Fano varieties”, arXiv:2409.15718 (2025).

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