Furstenberg's weak-star convergence conjecture for times pp-invariant measures

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Let p,q2p,q\ge 2 be fixed multiplicatively independent integers, let T=R/Z{\mathbb T}={\mathbb R}/{\mathbb Z} be the circle group, and let Tn(x)=nxmod1T_n(x)=nx\mod 1. A Borel probability measure on T{\mathbb T} is continuous if it has no atom and is TpT_p-invariant when μ=Tpμ\mu=T_p\mu. Write ww^* for the weak-star topology on measures.

Furstenberg's weak-star convergence conjecture. If μ\mu is a continuous Borel probability measure on T{\mathbb T} that is TpT_p-invariant, then TqnμT_q^n\mu converges in the weak-star topology to normalized Lebesgue measure Leb\operatorname{Leb}.

This is the natural measure analogue of the Hausdorff convergence conjecture for invariant sets. The source identifies it as Furstenberg's Conjecture (C3) and states that it remains conjectural.

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Sources & referencesView supporting material

Primary source

Catalin Badea and Sophie Grivaux, “Around Furstenberg's times p, times q conjecture: times p-invariant measures with some large Fourier coefficients”, arXiv:2303.01089 (2024).

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