A Nonamenable "Factor" of a Euclidean Space

Timár, Ádám (2021) A Nonamenable "Factor" of a Euclidean Space. ANNALS OF PROBABILITY, 49 (3). pp. 1427-1449. ISSN 0091-1798

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Abstract

Answering a question of Benjamini, we present an isometry-invariant random partition of the Euclidean space R-d, d >= 3, into infinite connected indistinguishable pieces, such that the adjacency graph defined on the pieces is the 3-regular infinite tree. Along the way, it is proved that any finitely generated one-ended amenable Cayley graph can be represented in R-d as an isometry-invariant random partition of R-d to bounded polyhedra, and also as an isometry-invariant random partition of R-d to indistinguishable pieces. A new technique is developed to prove indistinguishability for certain constructions, connecting this notion to factor of IID's.

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