The giant component of excursion sets of spherical Gaussian ensembles: existence, uniqueness, and volume concentration

Stephen Muirhead; Igor Wigman

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arXiv · 2406.09659

The giant component of excursion sets of spherical Gaussian ensembles: existence, uniqueness, and volume concentration

Stephen Muirhead·Igor Wigman

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Abstract

We establish the existence and uniqueness of a well-concentrated giant component in the supercritical excursion sets of three important ensembles of spherical Gaussian random fields: Kostlan's ensemble, band-limited ensembles, and the random spherical harmonics. Our main results prescribe quantitative bounds for the volume fluctuations of the giant that are essentially optimal for non-monochromatic ensembles, and suboptimal but still strong for monochromatic ensembles. Our results support the emerging picture that giant components in Gaussian random field excursion sets have similar large-scale statistical properties to giant components in supercritical Bernoulli percolation. The proofs employ novel decoupling inequalities for spherical ensembles which are of independent interest.

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Stephen Muirhead, Igor Wigman. 2024-06-14. The giant component of excursion sets of spherical Gaussian ensembles: existence, uniqueness, and volume concentration. https://arxiv.org/abs/2406.09659

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