Gibbs Properties of the Bernoulli Field on Inhomogeneous Trees under the Removal of Isolated Sites

Abstract

We consider the i.i.d. Bernoulli field p with occupation density p 2 (0; 1) on a possibly non-regular countably in finite tree with bounded degrees. For large p, we show that the quasilocal Gibbs property, i.e. compatibility with a suitable quasilocal speci fication, is lost under the deterministic transformation which removes all isolated ones and replaces them by zeros, while a quasilocal specifi cation does exist at small p. Our results provide an example for an independent field in a spatially nonhomogeneous setup which loses the quasilocal Gibbs property under a local deterministic transformation.