English

The cohomological equation and cyclic cocycles for renormalizable minimal Cantor systems

Dynamical Systems 2024-10-11 v1 Operator Algebras

Abstract

For typical properly ordered and minimal Bratteli diagrams (B,r)(B,\leq_r), it is shown that there are finitely many invariant distributions Di\mathcal{D}_i which are the only obstructions to solving the cohomological equation f=uuϕf = u-u\circ \phi for the corresponding adic transformation ϕ:XBXB\phi:X_B\rightarrow X_B and for α\alpha-H\"older ff with α\alpha large enough. These invariant distributions are then used to define cyclic cocycles, a.k.a. traces τ:K0(Aϕ)R\tau:K_0(\mathcal{A}_\phi)\rightarrow \mathbb{R} for the crossed product algebra Aϕ\mathcal{A}_\phi.

Keywords

Cite

@article{arxiv.2410.08124,
  title  = {The cohomological equation and cyclic cocycles for renormalizable minimal Cantor systems},
  author = {Rodrigo Treviño},
  journal= {arXiv preprint arXiv:2410.08124},
  year   = {2024}
}

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