Comparable weak and strong moments for symmetric log-concave measures

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 pq2p\geq q\geq 2, comparable weak and strong moments with constant γ\gamma means

(x(xq,dμ)1/qpdμ)1/pγsupu1(u,xpdμ)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.

Sources & referencesView supporting material

Primary source

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

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