A non-homogeneous local $Tb$ theorem for Littlewood-Paley $g_{\lambda}^{*}$-function with $L^p$-testing condition

TL;DR

This paper establishes a local $Tb$ theorem for the non-homogeneous Littlewood-Paley $g_{ ext{lambda}}^{*}$-function with non-convolution kernels and $L^p$ testing, providing new insights into its boundedness under specific conditions.

Contribution

It introduces the first $L^p$ testing condition for the $g_{ ext{lambda}}^{*}$-function in a non-homogeneous, local setting, combining three attributes simultaneously.

Findings

Proves the norm inequality for $g_{ ext{lambda}}^{*}$-function under the testing condition.

Establishes equivalence between the boundedness and the testing condition for $p ext{ in } (1,2].

First investigation of $g_{ ext{lambda}}^{*}$-function with local, non-homogeneous, and $L^p$ testing attributes.

Abstract

In this paper, we present a local $Tb$ theorem for the non-homogeneous Littlewood-Paley $g_{\lambda}^{*}$-function with non-convolution type kernels and upper power bound measure $\mu$. We show that, under the assumptions $\supp b_Q \subset Q$, $|\int_Q b_Q d\mu| \gtrsim \mu(Q)$ and $||b_Q||^p_{L^p(\mu)} \lesssim \mu(Q)$, the norm inequality $\big\| g_{\lambda}^{*}(f) \big\|_{L^p(\mu)} \lesssim \big\| f \big\|_{L^p(\mu)}$ holds if and only if the following testing condition holds : $$\sup_{Q : cubes \ in \ \Rn} \frac{1}{\mu(Q)}\int_Q \bigg(\int_{0}^{\ell(Q)} \int_{\Rn} \Big(\frac{t}{t+|x-y|}\Big)^{m\lambda}|\theta_t(b_Q)(y,t)|^2 \frac{d\mu(y) dt}{t^{m+1}}\bigg)^{p/2} d\mu(x) < \infty.$$ This is the first time to investigate $g_\lambda^*$-function in the simultaneous presence of three attributes : local, non-homogeneous and $L^p$-testing condition. It is important to note that the testing condition here is $L^p$ type with $p \in (1,2]$.