Strong topological Rokhlin property, shadowing, and symbolic dynamics of countable groups
arXiv (Cornell University)(2022)
Abstract
A countable group G has the strong topological Rokhlin property (STRP) if
it admits a continuous action on the Cantor space with a comeager conjugacy
class. We show that having the STRP is a symbolic dynamical property. We prove
that a countable group G has the STRP if and only if certain sofic subshifts
over G are dense in the space of subshifts. A sufficient condition is that
isolated shifts over G are dense in the space of all subshifts.
We provide numerous applications including the proof that a group that
decomposes as a free product of finite or cyclic groups has the STRP. We show
that finitely generated nilpotent groups do not have the STRP unless they are
virtually cyclic; the same is true for many groups of the form G_1×
G_2× G_3 where each factor is recursively presented. We show that a large
class of non-finitely generated groups do not have the STRP, this includes any
group with infinitely generated center and the Hall universal locally finite
group.
We find a very strong connection between the STRP and shadowing, a.k.a.
pseudo-orbit tracing property. We show that shadowing is generic for actions of
a finitely generated group G if and only if G has the STRP.
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Key words
strong topological rokhlin property,countable groups,symbolic dynamics
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