Off-diagonal bump conjecture for sparse operators

Let TT be a sparse operator, let 1<p<q<1<p<q<\infty, and let Dp,p\mathcal{D}_{p,p} and Dp,p\mathcal{D}^{\ast}_{p,p} denote the corresponding direct comparison bump quantities for the case p=qp=q. Off-diagonal bump conjecture. One has

Tσ:Lp(σ)Lp(w)Dp,p+Dp,p.\left\|T\sigma\cdot:L^p(\sigma)\to L^p(w)\right\| \lesssim \mathcal{D}_{p,p}+\mathcal{D}^{\ast}_{p,p}.

This conjecture concerns two-weight boundedness for sparse operators and is motivated by comparisons with Orlicz bump conjectures. The source notes that Lerner almost proves it, but does not state that it has been resolved.

Sources & referencesView supporting material

Primary source

Rob Rahm, “Off-Diagonal Two Weight Bumps for Fractional Sparse Operators”, arXiv:2101.02123 (2021).

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