Scaling scenery of $(\times m,\times n)$ invariant measures

We study the scaling scenery and limit geometry of invariant measures for the non-conformal toral endomorphism $(x,y)\mapsto (mx\mathrm{m}\mathrm{o}\mathrm{d}1,ny\mathrm{m}\mathrm{o}\mathrm{d}1)$ that are Bernoulli measures for the natural Markov partition. We show that the statistics of the scaling can be described by an ergodic CP-chain in the sense of Furstenberg. Invoking the machinery of CP-chains yields a projection theorem for Bernoulli measures, which generalises in part earlier results by Hochman-Shmerkin and Ferguson-Jordan-Shmerkin. We also give an ergodic theoretic criterion for the dimension part of Falconer’s distance set conjecture for general sets with positive length using CP-chains and hence verify it for various classes of fractals such as self-affine carpets of Bedford-McMullen, Lalley-Gatzouras and Bara'nski class and all planar self-similar sets.