Weak-$A_{\infty }$ packing and estimates for fractional sparse forms on spaces of homogeneous type

Abstract

We prove two-weight estimates for fractional sparse forms on spaces of homogeneous type. The relevant transformed weights are assumed to belong to weak-$A_{\infty }$. The weak reverse Hölder inequality is normalized on enlarged balls, while sparse testing is normalized on dyadic cubes. To measure this loss, we introduce ${\mathfrak{d}}_Q^w:=w(Q)/w(2\hat{I}›B_Q)$. A packing estimate for the defect levels, combined with two-weight testing, gives the required mixed weak-$A_{\infty }$ bounds.

17 pages