Ultrametric organization of TAP states

From papers

Let DD be the open set from the quenched complexity formula. For fDf\in D, let θ\theta be the optimizer in that formula and let ζ\zeta minimize

Λ~(θ)=θinfζ:ζ([0,sup(suppζ)))=θParisi(ζ).\widetilde{\Lambda}(\theta)=\theta\inf_{\zeta:\,\zeta([0,\sup(\operatorname{supp}\zeta)))=\theta}\mathcal{P}\mathrm{arisi}(\zeta).

Ultrametric organization conjecture. The TAP critical points at free-energy level ff are organized in an ultrametric tree; uniformly sampled overlaps between two such states take values in the support of ζ\zeta. If ffeq:=infζParisi(ζ)f\neq f_{\mathrm{eq}}:=\inf_\zeta\mathcal{P}\mathrm{arisi}(\zeta), the ancestor states have TAP free energy Parisi(ζ)f\mathcal{P}\mathrm{arisi}(\zeta)\neq f, and the quenched complexity of the ancestor states is 00, so their number grows at most subexponentially in NN.

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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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