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

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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 x∈Zx\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.

References

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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