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

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Let p,q≥2p,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)=nxmod  1T_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 w∗w^* 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.

References

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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