English

Moment estimates for convex measures

Probability 2015-01-06 v1 Metric Geometry

Abstract

Let p1p\geq 1, \eps>0\eps >0, r(1+\eps)pr\geq (1+\eps) p, and XX be a (1/r)(-1/r)-concave random vector in Rn\R^n with Euclidean norm X|X|. We prove that (\EXp)1/pc(C(\eps)\EX+σp(X))(\E |X|^{p})^{1/{p}}\leq c (C(\eps) \E|X|+\sigma_{p}(X)), where σp(X)=supz1(\E<z,X>p)1/p\sigma_{p}(X)=\sup_{|z|\leq 1}(\E|<z,X>|^{p})^{1/p}, C(\eps)C(\eps) depends only on \eps\eps and cc is a universal constant. Moreover, if in addition XX is centered then (\EXp)1/pc(\eps)(\EXCσp(X))(\E |X|^{-p})^{-1/{p}}\geq c(\eps) (\E|X| - C \sigma_{p}(X)).

Keywords

Cite

@article{arxiv.1207.6618,
  title  = {Moment estimates for convex measures},
  author = {Radosław Adamczak and Olivier Guédon and Rafał Latała and Alexander E. Litvak and Krzysztof Oleszkiewicz and Alain Pajor and Nicole Tomczak-Jaegermann},
  journal= {arXiv preprint arXiv:1207.6618},
  year   = {2015}
}
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