Khinchin-type inequalities via Hadamard's factorisation
Probability
2025-01-28 v2
Abstract
We prove Khinchin-type inequalities with sharp constants for type L random variables and all even moments. Our main tool is Hadamard's factorisation theorem from complex analysis, combined with Newton's inequalities for elementary symmetric functions. Besides the case of independent summands, we also treat ferromagnetic dependencies in a nonnegative external magnetic field (thanks to Newman's generalisation of the Lee-Yang theorem). Lastly, we compare the notions of type L, ultra sub-Gaussianity (introduced by Nayar and Oleszkiewicz) and strong log-concavity (introduced by Gurvits), with the latter two being equivalent.
Cite
@article{arxiv.2102.09500,
title = {Khinchin-type inequalities via Hadamard's factorisation},
author = {Alex Havrilla and Piotr Nayar and Tomasz Tkocz},
journal= {arXiv preprint arXiv:2102.09500},
year = {2025}
}
Comments
Final version. To appear in Int. Math. Res. Not. IMRN