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Estimates of norms of log-concave random matrices with dependent entries

Probability 2025-02-05 v1 Functional Analysis

Abstract

We prove estimates for EX:pnqm\mathbb{E} \| X: \ell_{p'}^n \to \ell_q^m\| for p,q2p,q\ge 2 and any random matrix XX having the entries of the form aijYija_{ij}Y_{ij}, where Y=(Yij)1im,1jnY=(Y_{ij})_{1\le i\le m, 1\le j\le n} has i.i.d. isotropic log-concave rows. This generalises the result of Gu\'edon, Hinrichs, Litvak, and Prochno for Gaussian matrices with independent entries. Our estimate is optimal up to logarithmic factors. As a byproduct we provide the analogue bound for m×nm\times n random matrices, which entries form an unconditional vector in Rmn\mathbb{R}^{mn}. We also prove bounds for norms of matrices which entries are certain Gaussian mixtures.

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Cite

@article{arxiv.1902.01150,
  title  = {Estimates of norms of log-concave random matrices with dependent entries},
  author = {Marta Strzelecka},
  journal= {arXiv preprint arXiv:1902.01150},
  year   = {2025}
}

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16 pages