The equality of the sharp and recursive Potts constants

From papers

Let qq be the number of Potts symbols, let HH and RgR g be the functions defined from the Potts recursion, and define

c^(β,q):=suppP,p2==pqH(p1,,pq)Rg(p1,,pq).\hat c(\beta,q):=\sup_{p\in P,\,p_2=\dots=p_q}\frac{H(p_1,\dots,p_q)}{R g(p_1,\dots,p_q)}.

Here cˉ(β,q)\bar c(\beta,q) is the constant appearing in the paper's linear recursion bound.

Equality conjecture. We believe that

c^(β,q)=cˉ(β,q).\hat c(\beta,q)=\bar c(\beta,q).

This conjecture concerns whether the variational constant obtained by restricting to vectors with equal coordinates p2==pqp_2=\dots=p_q coincides with the constant used in the reconstruction estimate. The source gives no resolution of this claim.

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Sources & referencesView supporting material

Primary source

M. Formentin and C. Kuelske, “On the Purity of the free boundary condition Potts measure on random trees”, arXiv:0810.0677 (2009).

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