Comparable weak and strong moments for symmetric log-concave measures

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Let μ\mu be a probability measure on Rn\mathbb R^n, and let ∣⋅∣\\|\cdot\\| be any norm on Rn\mathbb R^n with dual norm ∣⋅∣∗\\|\cdot\\|_*. For p≥q≥2p\geq q\geq 2, comparable weak and strong moments with constant γ\gamma means

(∫∣∣x∣−(∫∣x∣q,dμ)1/q∣pdμ)1/p≤γsup⁡∣u∣∗≤1(∫∣⟨u,x⟩∣pdμ)1/p.\left(\int \left|\\|x\\|-\left(\int \\|x\\|^q\\,d\mu\right)^{1/q}\right|^p d\mu\right)^{1/p} \leq \gamma\sup_{\\|u\\|_*\leq 1}\left(\int |\langle u,x\rangle|^p d\mu\right)^{1/p}.

Comparable weak and strong moments conjecture. Every symmetric log-concave probability measure on Rn\mathbb R^n satisfies CWSM(C)\mathrm{CWSM}(C).

The preceding proposition derives a comparable-moments estimate from the concentration inequality, so the conjecture would follow from the paper's broader concentration conjecture. The supplied text does not state a resolution.

References

Primary source

Rafał Latała and Jakub Onufry Wojtaszczyk, “On the infimum convolution inequality”, arXiv:0801.4036 (2008).

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