Finitely Summable $K$-homology, the Index Pairing, and Cantor Minimal Systems

We study index pairings for crossed-product $C^*$-algebras arising from minimal actions on the Cantor set. We utilize Putnam's orbit-breaking AF-subalgebras and embeddings to show we can compute any index pairing for Cantor minimal system crossed products using Connes' trace formulas. In the case of odometers, we show that the associated algebras have uniformly finitely summable $K$-homology.

Publication Details

Journal
ArXiv.org
Published
2025-05-29
Primary Topic
Advanced Operator Algebra Research
Type
article
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article

Finitely Summable $K$-homology, the Index Pairing, and Cantor Minimal Systems

ArXiv.org
Advanced Operator Algebra Research
article

Finitely Summable $K$-homology, the Index Pairing, and Cantor Minimal Systems

article en

Abstract

We study index pairings for crossed-product $C^*$-algebras arising from minimal actions on the Cantor set. We utilize Putnam's orbit-breaking AF-subalgebras and embeddings to show we can compute any index pairing for Cantor minimal system crossed products using Connes' trace formulas. In the case of odometers, we show that the associated algebras have uniformly finitely summable $K$-homology.

ArXiv.org
Openalex Percentile: Top 46%
Advanced Operator Algebra Research
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Finitely Summable $K$-homology, the Index Pairing, and Cantor Minimal Systems · ArXiv.org (2025) | TGRS Research Map | TGRS