On the square function associated with generalized Bochner-Riesz means

TL;DR

This paper establishes a critical $L^4$ estimate for a square function linked to generalized Bochner-Riesz means with rough distance functions, leading to new multiplier theorems for nonisotropic homogeneous functions.

Contribution

It introduces a critical $L^4$ estimate for the square function associated with generalized Bochner-Riesz multipliers involving rough, nonisotropic distance functions, enabling new multiplier results.

Findings

Proved a critical $L^4$ estimate for the square function.

Derived new multiplier theorems for functions composed with rough distance functions.

Extended the understanding of Bochner-Riesz means with nonisotropic homogeneity.

Abstract

We consider generalized Bochner-Riesz multipliers of the form $(1-\rho(\xi))_+^{\lambda}$ where $\rho:\mathbb{R}^2\to\mathbb{R}$ belongs to a class of rough distance functions homogeneous with respect to a nonisotropic dilation group. We prove a critical $L^4$ estimate for the associated square function, which we use to derive multiplier theorems for multipliers of the form $m\circ\rho$ where $m:\mathbb{R}\to\mathbb{C}$.