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Antti Käenmäki: Thermodynamic formalism of countably generated self-affine sets

Time: Thu 2023-10-05 13.15

Location: Room 3418, Lindstedtsvägen 25

Participating: Antti Käenmäki: Oulu University 

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Abstract: We further develop the thermodynamic formalism of affine iterated function systems with countably many transformations by showing the existence and extending earlier characterisations of the equilibrium states of finite affine iterated function systems to the countably infinite case. As an application, under mild conditions, we prove that the affinity dimension of a countable affine iterated function system is equal to the supremum of the affinity dimensions of its finite subsystems. We deduce corollaries concerning the Hausdorff dimension of countably generated self-affine sets in dimensions 1, 2, and 3 satisfying mild deterministic assumptions and in arbitrary dimensions with generic translations. The talk is based on a joint work with Ian Morris.