2010/04/05 by Anders Johansson, Anders Öberg, Mark Pollicott · 1 citation
Mathematics · #math.DS #math.PR #msc:37A05 #msc:37A35 #msc:60G10
paper · pdf · doi:10.4171/jems/342
published as Journal of the European Mathematical Society, 14 (2012) (5): 1599-1615
arxiv created 2010/04/05 · arxiv updated 2014/12/02
We improve and subsume the conditions of Johansson and Öberg [18] and Berbee [2] for uniqueness of a g-measure, i.e., a stationary distribution for chains with complete connections. In addition, we prove that these unique g-measures have Bernoulli natural extensions. In particular, we obtain a unique g-measure that has the Bernoulli property for the full shift on finitely many states under any one of the following additional assumptions. (1) ∑n=1^∞ (\varn log g)2<∞, (2) For any fixed ε>0, ∑n=1^∞ e^-(\12+ε) (\var1 log g+...+\varn log g)=∞, (3) \varn log g=\ordo\1√(n), n→ ∞. That the measure is Bernoulli in the case of (1) is new. In (2) we have an improved version of Berbee's condition (concerning uniqueness and Bernoullicity) [2], allowing the variations of log g to be essentially twice as large. Finally, (3) is an example that our main result is new both for uniqueness and for the Bernoulli property. We also conclude that we have convergence in the Wasserstein metric of the iterates of the adjoint transfer operator to the g-measure.