FMP stability conjecture for big movable classes

Let XX be a compact Kähler manifold of dimension nn, and let α,βMov1(X)\alpha,\beta\in\operatorname{Mov}^1(X) be big movable classes. Let F(α,β)F(\alpha,\beta) denote their relative asymmetry index, and let σ(α,β)\sigma(\alpha,\beta) and B(α,β)B(\alpha,\beta) denote the relative size index and the Brunn–Minkowski deficit. FMP stability conjecture. There exists a constant c(n)c(n) depending only on nn such that

F(α,β)c(n)(σ(α,β)B(α,β))12.F(\alpha,\beta)\leq c(n)\bigl(\sigma(\alpha,\beta)B(\alpha,\beta)\bigr)^{\frac12}.

This is the proposed Kähler-geometric analogue of the Fusco–Maggi–Pratelli and Figalli–Maggi–Pratelli stability estimate for convex bodies. Its validity for arbitrary big movable classes is left open.

Sources & referencesView supporting material

Primary source

Jiajun Hu and Jian Xiao, “Positivity in the shadow of Hodge index theorem”, arXiv:2505.06626 (2025).

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