Non-degeneracy of conditional limits for multi-spin systems with uniform mark distribution

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Let X\mathcal{X} be a finite set, let hh be an edge potential, and let ν=Unif(X)\nu=\mathsf{Unif}(\mathcal{X}). For c∈(κhmin⁡,κhmax⁡)c\in (\kappa h_{\min},\kappa h_{\max}), let UnU_n denote the relevant Gibbs measure conditioned on Conset⁡n(h,c)\operatorname{Conset}_n(h,c), and let Gibbsnondeg⁡(c)\operatorname{Gibbsnondeg}(c) be the set of non-degenerate Gibbs measures defined by the preceding construction.

Non-degeneracy conjecture. For every c∈(κhmin⁡,κhmax⁡)c\in (\kappa h_{\min},\kappa h_{\max}), UnU_n given Conset⁡n(h,c)\operatorname{Conset}_n(h,c) lies asymptotically in Gibbsnondeg⁡(c)\operatorname{Gibbsnondeg}(c).

The conjecture proposes that conditional limits are always non-degenerate for multi-spin systems with a uniform mark distribution, extending the proved result for two-spin systems. The source presents this as an open question; the general case remains unresolved.

References

Primary source

I-Hsun Chen, Ivan Lee, Kavita Ramanan and Sarath Yasodharan, “Gibbs conditioning, atypical consensus and splitting Gibbs measures on random regular graphs”, arXiv:2603.01322 (2026).

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