The fixed-width Lipschitz Kakeya maximal-function conjecture

Let vv be a Lipschitz map from R2\mathbb R^2 to the unit circle. For rectangles RR satisfying VRδR|\operatorname V R|\geq\delta|R| and wWR2w\mathsf w\leq\operatorname W R\leq2\mathsf w, define

Mδ,v,wf(x)=sup1R(x)RRf(y)dy.\operatorname M_{\delta,v,\mathsf w}f(x)=\sup\frac{\mathbf 1_R(x)}{|R|}\int_R|f(y)|\,dy.

Fixed-width Lipschitz Kakeya conjecture. For some 1<p<21<p<2 and some finite NN, for all 0<δ<10<\delta<1, all Lipschitz vector fields vv, and 0<w<1100vLip0<\mathsf w<\frac1{100\|v\|_{\operatorname{Lip}}}, the operator Mδ,v,w\operatorname M_{\delta,v,\mathsf w} maps Lp(R2)L^p(\mathbb R^2) to Lp,(R2)L^{p,\infty}(\mathbb R^2) with norm at most δN\lesssim\delta^{-N}. This fixed-width form is stronger than what is needed for the paper's conditional Hilbert-transform results and is not verified in the source.

Sources & referencesView supporting material

Primary source

Michael Lacey and Xiaochun Li, “On a Conjecture of EM Stein on the Hilbert Transform on Vector Fields”, arXiv:0704.0808 (2008).

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