Latała's moment conjecture for norms of log-concave vectors

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A random vector XX with values in a finite-dimensional normed space (F,∥ ∥)(F,\|\ \|) is log-concave if its distribution is a log-concave measure. Let F∗F^* be the dual space, with dual norm ∥φ∥∗\|\varphi\|_*. For p≥1p\geq 1, define the weak pp-th moment of ∥X∥\|X\| by

sup⁡φ∈F∗,∥φ∥∗≤1(E∣φ(X)∣p)1/p.\sup_{\varphi\in F^*,\|\varphi\|_*\leq 1}\left(\mathbb{E}|\varphi(X)|^p\right)^{1/p}.

Latała's moment conjecture. There exists a universal constant CC such that, for every log-concave vector XX with values in a finite-dimensional normed space (F,∥ ∥)(F,\|\ \|) and every p≥1p\geq 1,

(E∥X∥p)1/p≤C(E∥X∥+sup⁡φ∈F∗,∥φ∥∗≤1(E∣φ(X)∣p)1/p).\left(\mathbb{E}\|X\|^p\right)^{1/p}\leq C\left(\mathbb{E}\|X\|+\sup_{\varphi\in F^*,\|\varphi\|_*\leq 1}\left(\mathbb{E}|\varphi(X)|^p\right)^{1/p}\right).

This conjecture seeks to extend Paouris's inequality from the Euclidean norm to arbitrary norms. The source says it was formulated and discussed in Latała's work; the supplied material gives no resolution status.

References

Primary source

Rafał Latała and Marta Strzelecka, “Weak and strong moments of l_r-norms of log-concave vectors”, arXiv:1501.01649 (2015).

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