English

Distal actions and shifted convolution property

Probability 2024-06-06 v1 Dynamical Systems Group Theory

Abstract

A locally compact group GG is said to have shifted convolution property (abbr. as SCP) if for every regular Borel probability measure μ\mu on GG, either supxGμn(Cx)\ra0\sup_{x\in G} \mu ^n (Cx) \ra 0 for all compact subsets CC of GG, or there exist xGx\in G and a compact subgroup KK normalised by xx such that μnxn\raωK\mu^nx^{-n} \ra \omega_K, the Haar measure on KK. We first consider distality of factor actions of distal actions. It is shown that this holds in particular for factors under compact groups invariant under the action and for factors under the connected component of identity. We then characterize groups having SCP in terms of a readily verifiable condition on the conjugation action (point-wise distality). This has some interesting corollaries to distality of certain actions and Choquet Deny measures which actually motivated SCP and point-wise distal groups. We also relate distality of actions on groups to that of the extensions on the space of probability measures.

Keywords

Cite

@article{arxiv.0806.1820,
  title  = {Distal actions and shifted convolution property},
  author = {C. R. E. Raja and R. Shah},
  journal= {arXiv preprint arXiv:0806.1820},
  year   = {2024}
}
R2 v1 2026-06-21T10:49:29.357Z