Sparse reconstruction in spin systems II: Ising and other factor of IID measures

For a sequence of Boolean functions fₙ : \-1, 1ₙ \-1, 1\, with random input given by some probability measure Pₙ, we say that there is sparse reconstruction for fₙ if there is a sequence of subsets Uₙ ⊆ Vₙ of coordinates satisfying |Uₙ| = o(|Vₙ|) such that knowing the spins in Uₙ gives us a non-vanishing amount of information about the value of fₙ. In the first part of this work, we showed that if the Pₙs are product measures, then no sparse reconstruction is possible for any sequence of transitive functions. In this sequel, we consider spin systems that are relatives of IID measures in one way or another, with our main focus being on the Ising model on finite transitive graphs or exhaustions of lattices. We prove that no sparse reconstruction is possible for the entire high temperature regime on Euclidean boxes and the Curie-Weiss model, while sparse reconstruction for the majority function of the spins is possible in the critical and low temperature regimes. We give quantitative bounds for two-dimensional boxes and the Curie-Weiss model, sharp in the latter case. The proofs employ several different methods, including factor of IID and FK random cluster representations, strong spatial mixing, a generalization of discrete Fourier analysis to Divide-and-Color models, and entropy inequalities.