Fourier decay and non-decay for pseudo-affine self-conformal measures

Abstract

We study the sharpness of recent sufficient conditions for polynomial Fourier decay of self conformal measures on the line. First, we construct a $C^{\infty }$ iterated function system which is not $C^1$-conjugate to self-similar, but which nevertheless admits a stationary measure that is not Rajchman. Second, for every strongly separated Bernoulli convolution $\mu$ and every $1\le r<\infty$, we construct a $C^r$-diffeomorphism $h$ such that $h^{\prime }$ is constant on $\mathrm{supp}\mu$, yet the image measure $h\mu$ has polynomial Fourier decay. All constructions are within the framework of pseudo-affine iterated function systems, previously introduced by the authors.