Reverse Hölder self-improvement conjecture

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Let ww be a weight on cubes QQ, and define the reverse Hölder characteristic by

[w]RH⁡p:=sup⁡Q(∣Q∣−1∫Qwp dx)1/p∣Q∣−1∫Qw dx.[w]_{\operatorname{RH}_p}:=\sup_Q\frac{\left(|Q|^{-1}\int_Q w^p\,dx\right)^{1/p}}{|Q|^{-1}\int_Qw\,dx}.

Reverse Hölder self-improvement conjecture. If w∈RH⁡pw\in\operatorname{RH}_p and 1<p<∞1<p<\infty, then for

0<ε≲d,p1[w]RH⁡pp,0<\varepsilon\lesssim_{d,p}\frac{1}{[w]_{\operatorname{RH}_p}^{p}},

one has

1∣Q∣∫Qwp+ε dx≤2[w]RH⁡pp+ε(1∣Q∣∫Qw dx)p+ε.\frac{1}{|Q|}\int_Qw^{p+\varepsilon}\,dx\le 2[w]_{\operatorname{RH}_p}^{p+\varepsilon}\left(\frac{1}{|Q|}\int_Qw\,dx\right)^{p+\varepsilon}.

This conjectures a quantitative higher-integrability estimate for reverse Hölder weights with an exponent range controlled by the reverse Hölder characteristic; the source gives no evidence that it has been resolved.

References

Primary source

Dario Mena, Maria Carmen Reguera and Luz Roncal, “Weighted Weak Type estimates for non-integral Square Functions”, arXiv:2506.14897 (2025).

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