Subcritical Gaussian multiplicative chaos Fourier coefficient limit conjecture

Let γ(1/2,2)\gamma\in(1/\sqrt{2},\sqrt{2}), let μγ\mu_\gamma be the Gaussian multiplicative chaos measure on [0,1][0,1] with parameter γ\gamma, and let cnc_n be its nn-th Fourier coefficient. Subcritical Fourier coefficient limit conjecture. The random variables

(logn)3γ/(22)n(2γ)2/2cn(\log n)^{3\gamma/(2\sqrt{2})}n^{(\sqrt{2}-\gamma)^2/2}|c_n|

should converge in distribution, as nn\to\infty, to a non-trivial limiting random variable. This is a heuristic prediction for the subcritical range γ(1/2,2)\gamma\in(1/\sqrt{2},\sqrt{2}); the surrounding discussion explicitly says that the heuristics are not made rigorous there.

Sources & referencesView supporting material

Primary source

Louis-Pierre Arguin and Jad Hamdan, “On the Fourier coefficients of critical Gaussian multiplicative chaos”, arXiv:2510.24424 (2026).

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