FMP stability conjecture for big movable classes

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Let XX be a compact Kähler manifold of dimension nn, and let α,β∈Mov⁡1(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.

References

Primary source

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

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