The annealed complexity formula for TAP critical points

Let FTAPF_{\mathrm{TAP}} be the TAP free energy, and for fRf\in\mathbb{R} and ε>0\varepsilon>0 let Nε(f)\mathcal{N}_\varepsilon(f) denote the number of its critical points in the free-energy window N(fε,f+ε)N(f-\varepsilon,f+\varepsilon). Define

Λ(θ)=θinfζ:ζ({0})=θParisi(ζ).\Lambda(\theta)=\theta\inf_{\zeta:\zeta(\{0\})=\theta}\mathcal{P}\mathrm{arisi}(\zeta).

The annealed complexity formula. There exists an open subset DRD\subset\mathbb{R} containing [infζParisi(ζ),+)[\inf_\zeta\mathcal{P}\mathrm{arisi}(\zeta),+\infty) such that, for every fDf\in D,

limε0limN1NlogE[Nε(f)]=Λ(f)=infθ(Λ(θ)θf).\lim_{\varepsilon\to 0}\lim_{N\to\infty}\frac{1}{N}\log\mathbb{E}\bigl[\mathcal{N}_\varepsilon(f)\bigr]=-\Lambda^*(f)=\inf_\theta\bigl(\Lambda(\theta)-\theta f\bigr).

This conjecture asserts that the annealed complexity is governed by the Legendre transform of the Parisi variational formula. The preceding theorem gives a rigorous lower bound under tail-optimality and stationarity assumptions; the equality remains conjectural.

Sources & referencesView supporting material

Primary source

Jeanne Boursier, “The Legendre structure of the TAP complexity for the Ising spin glass”, arXiv:2604.20660 (2026).

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