Maximal operators given by Fourier multipliers with dilation of fractional dimensions

Abstract

In this paper, we investigate $L^p$ bounds of maximal Fourier multiplier operators with dilation of fractional dimensions. For Fourier multipliers, we suggest a criterion related to dimensions of dilation sets which guarantees $L^p$ bounds of the maximal operators for each $p$. Our criterion covers Mikhlin-type multipliers, multipliers with limited decay, and multipliers with slow decay.

19 pages, to appear in JFA; we added comments for dimensions of sequences (see Corollary 3.3)