Logarithmic L~p Bounds for Maximal Directional Singular Integrals in the Plane

摘要

Let K be a Calderón–Zygmund convolution kernel on R. We discuss the L~p-boundedness of the maximal directional singular integral TVf (x) = sup v∈V|∫_R f (x +tv)K(t) dt| where V is a finite set of N directions. Logarithmic bounds (for 2 ≤ p < ∞) are established for a set V of arbitrary structure. Sharp bounds are proved for lacunary and Vargas sets of directions. The latter include the case of uniformly distributed directions and the finite truncations of the Cantor set. We make use of both classical harmonic analysis methods and product-BMO based time-frequency analysis techniques. As a further application of the latter, we derive an L~p almost orthogonality principle for Fourier restrictions to cones.