Joyce's stability and special Lagrangian conjecture

Let (M,ω,Ω)(M,\omega,\Omega) be a compact Calabi–Yau nn-fold, where ω\omega is a Kähler form and Ω\Omega is a holomorphic volume form. Let DFuk(M)\operatorname{DFuk}(M) denote its derived Fukaya category, whose objects are Lagrangian branes L\mathbb{L}.

Joyce's conjecture. There exists a Bridgeland stability condition σ=(Z,P)\sigma=(Z,\mathcal{P}) on DFuk(M)\operatorname{DFuk}(M) such that the central charge is induced by

K0(DFuk(M))L[L]Hn(M,Z)[L][L]ΩC,K_0\left(\operatorname{DFuk}(M)\right)\xrightarrow{\mathbb{L}\mapsto[L]}H_n(M,\mathbb{Z})\xrightarrow{[L]\mapsto\int_{[L]}\Omega}\mathbb{C},

where LML\subseteq M is the underlying Lagrangian of L\mathbb{L}, and an object L\mathbb{L} is σ\sigma-semistable if and only if its underlying Lagrangian admits a possibly singular special Lagrangian representative.

This is a simplified version of Joyce's conjecture relating Bridgeland stability in derived Fukaya categories to special Lagrangians. The conjecture remains largely open; the paper constructs higher-dimensional examples in a non-geometric setting.

Sources & referencesView supporting material

Primary source

Yu-Wei Fan, “Special Lagrangians and Bridgeland stable objects beyond geometric stability conditions: the product case”, arXiv:2602.03041 (2026).

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