Uniqueness of the stationary distribution for attractive spin systems in a unique stationary environment

Let the background process have a unique stationary distribution. For each environment state i{1,2}i\in\{1,2\}, let ci(x,η)c_i(x,\eta) be the flip rate at site xZx\in\mathbb{Z} for configuration η{0,1}Z\eta\in\{0,1\}^{\mathbb{Z}}. Uniqueness conjecture. If

ci(x,η)>0c_i(x,\eta)>0

for all xx, η\eta, and i=1,2i=1,2, then the two extremal stationary distributions coincide:

ν0=ν1.\nu_0=\nu_1.

This is proposed as an analogue of Gray's theorem for spin systems without a background process, which gives uniqueness under strict positivity of the rates. The statement concerns whether the same positivity condition ensures uniqueness when the environment evolves randomly.

Sources & referencesView supporting material

Primary source

Marcus Warfheimer, “Attractive nearest-neighbor spin systems on the integers in a randomly evolving environment”, arXiv:0712.2929 (2010).

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