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From Gaussian to Gumbel: extreme eigenvalues of complex Ginibre products with exact rates

2025/10/09 by Yutao Ma, Ma, Yutao, Meng, Xujia · 1 citation
Mathematics · #15B52 #60F10 #FOS: Mathematics #Mathematical functions and polynomials #Probability (math.PR) #Random Matrices and Applications #Spectral Theory in Mathematical Physics #Statistics Theory (math.ST)

paper · pdf · doi:10.48550/arxiv.2510.07942

openalex publication_date 2025/10/09 · openalex created_date 2025/10/11 · openalex updated_date 2026/07/28

Abstract

Let Z1, ⋯, Zn denote the eigenvalues of the product ∏j=1kn \boldsymbolAj, where \\boldsymbolAj\1 ≤ j ≤ kn are independent n× n complex Ginibre matrices. Define α= limn → ∞ (n)/(kn). We prove that Xn, a suitably rescaled version of max1 ≤ j ≤ n |Zj|2, converges weakly as follows: to a non-trivial distribution Φα for α∈ (0, +∞), to the Gumbel distribution when α= +∞, and to the standard normal distribution when α= 0. This result reveals a phase transition at the boundaries of α. Furthermore, we establish the exact rates of convergence in each regime.

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