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Harmonic analysis of multiplicative chaos Part II: a unified approach to Fourier dimensions
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abstract
We introduce a unified approach for studying the polynomial Fourier decay of classical multiplicative chaos measures. As consequences, we obtain the precise Fourier dimensions for multiplicative chaos measures arising from the following key models: the sub-critical 1D and 2D GMC (which in particular resolves the Garban-Vargas conjecture); the sub-critical $d$-dimensional GMC with $d \ge 3$ when the parameter $\gamma$ is near the critical value; the canonical Mandelbrot random coverings; the canonical Mandelbrot cascades. For various other models, we establish the non-trivial lower bounds of the Fourier dimensions and in various cases we conjecture that they are all optimal and provide the exact values of Fourier dimensions.
Forward citations
Cited by 2 Pith papers
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Exact values of Fourier dimensions of Gaussian multiplicative chaos on high dimensional torus
For a specially constructed log-correlated field on T^d, the GMC measure almost surely has Fourier dimension d-γ^2 when γ<√(2d)/2 and (√(2d)-γ)^2 when √(2d)/2<=γ<√(2d), for all d>=1.
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Microcanonical cascades and random homeomorphisms
Almost surely, the Fourier dimension of a Mandelbrot microcanonical cascade measure equals log_2(1/(E[W0^2]+E[W1^2])), settling the Mandelbrot-Kahane problem for this class.
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