Pointwise Estimates for Marginals of Convex Bodies

Details Pointwise Estimates for Marginals of Convex Bodies Pointwise Estimates for Marginals of Convex Bodies

2007-08-18

arxiv.org/abs/0708.2513v1

Mathematics

Metric Geometry

17 pages

Scientific paper

We prove a pointwise version of the multi-dimensional central limit theorem for convex bodies. Namely, let X be an isotropic random vector in R^n with a log-concave density. For a typical subspace E in R^n of dimension n^c, consider the probability density of the projection of X onto E. We show that the ratio between this probability density and the standard gaussian density in E is very close to 1 in large parts of E. Here c > 0 is a universal constant. This complements a recent result by the second named author, where the total-variation metric between the densities was considered.

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