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Harmonic analysis of multiplicative chaos Part II: a unified approach to Fourier dimensions

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arxiv 2505.03298 v4 pith:CFLZKCZW submitted 2025-05-06 math.PR math-phmath.DSmath.FAmath.MP

classification math.PRmath-phmath.DSmath.FAmath.MP
keywords fourierdimensionschaosmultiplicativeapproachcanonicalconjecturemandelbrot
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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.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Exact values of Fourier dimensions of Gaussian multiplicative chaos on high dimensional torus

    math.PR 2025-07 conditional novelty 8.0 of 10

    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.

  2. Microcanonical cascades and random homeomorphisms

    math.PR 2025-05 conditional novelty 8.0 of 10

    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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