On the spectral analysis of dynamical Möbius-Sarnak process and topological entropy of Möbius fonction

Abstract

By extending the Rokhlin-Sinai machinery relating to the entropy and countable Lebesgue component in the spectrum, we establish that the dynamical Möbius-Sarnak process has a countable Lebesgue component. Inspired by recent work of M. Lin and the author, we extend the notion of spectral measure to all operators on Banach spaces. This generalization is further motivated by the Bellow-Losert extension of Wiener's notion of the spectral measure of sequences. Furthermore, we establish unconditionally that the topological entropy of the Möbius flow is given by $\frac{6}{π^2}\log 3$. Among other consequences, we recover a recent result by el Abdalaoui-Nerurkar which asserts that for any quasi-generic measure for the Möbius function, the Möbius flow equipped with this measure has a countable Lebesgue component in its spectrum. It follows that the Sarnak Möbius orthogonality conjecture holds for any topological dynamical system with singular spectrum. We further show that all the potential spectral measures of he Möbius function are absolutely continuous with respect to Lebesgue measure.