Approximate transitivity property and Lebesgue spectrum

Details Approximate transitivity property and Lebesgue spectrum Approximate transitivity property and Lebesgue spectrum

2009-03-03

arxiv.org/abs/0903.0503v2

Mathematics

Dynamical Systems

20 pages

Scientific paper

Exploiting a spectral criterion for a system not to be AT we give some new examples of zero entropy systems without the AT property. Our examples include those with finite spectral multiplicity -- in particular we show that the system arising from the Rudin-Shapiro substitution is not AT. We also show that some nil-rotations on a quotient of the Heisenberg group as well as some (generalized) Gaussian systems are not AT. All known examples of non AT-automorphisms contain a Lebesgue component in the spectrum.

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