Invariant measures for non-primitive tiling substitutions

Details Invariant measures for non-primitive tiling substitutions Invariant measures for non-primitive tiling substitutions

2010-07-10

arxiv.org/abs/1007.1686v1

Mathematics

Dynamical Systems

43 pages

Scientific paper

We consider self-affine tiling substitutions in Euclidean space and the corresponding tiling dynamical systems. It is well-known that in the primitive case the dynamical system is uniquely ergodic. We investigate invariant measures when the substitution is not primitive, and the tiling dynamical system is non-minimal. We prove that all ergodic invariant probability measures are supported on minimal components, but there are other natural ergodic invariant measures, which are infinite. Under some mild assumptions, we completely characterize $\sigma$-finite invariant measures which are positive and finite on a cylinder set. A key step is to establish recognizability of non-periodic tilings in our setting. Examples include the "integer Sierpi\'nski gasket and carpet" tilings. For such tilings the only invariant probability measure is supported on trivial periodic tilings, but there is a fully supported $\sigma$-finite invariant measure, which is locally finite and unique up to scaling.

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