On p-adic Gibbs measures of the countable state Potts model on the Cayley tree

In this paper we consider the countable state p-adic Potts model on the Cayley tree. A construction of p-adic Gibbs measures which depends on weights λ is given, and an investigation of such measures is reduced to the examination of an infinite-dimensional recursion equation. By studying the derived equation under some condition concerning weights, we prove the absence of a phase transition. Note that the condition does not depend on values of the prime p, and the analogous fact is not true when the number of spins is finite. For the homogeneous model it is shown that the recursive equation has only one solution under that condition on weights. This means that there is only one p-adic Gibbs measure μ_λ. The boundedness of the measure is also established. Moreover, the continuous dependence of the measure μ_λ on λ is proved. At the end we formulate a one limit theorem for μ_λ.