Weighted variational inequalities for heat semigroups associated with Schr\"odinger operators related to critical radius functions

TL;DR

This paper develops new weighted inequalities and bounds for variation operators of heat semigroups associated with Schrödinger operators, extending classical weight classes and addressing two-weight inequalities.

Contribution

It introduces a new class of weights and weaker bump conditions for variation operators related to Schrödinger operators, advancing weighted inequality theory.

Findings

Quantitative weighted L^p bounds for variation operators

A new weaker bump condition for two-weight inequalities

Characterizations of weight classes via maximal operator estimates

Abstract

Let $\mathcal{L}$ be a Schr\"{o}dinger operator and $\mathcal{V}_\varrho(e^{-t\mathcal{L}})$ be the variation operator of heat semigroup associated to $\mathcal{L}$ with $\varrho>2$. In this paper, we first obtain the quantitative weighted $L^p$ bounds for $\mathcal{V}_\varrho(e^{-t\mathcal{L}})$ with a class of weights related to critical radius functions, which contains the classical Muckenhoupt weights as a proper subset. Next, a new bump condition, which is weaker than the classical bump condition, is given for two-weight inequality of $\mathcal{V}_\varrho(e^{-t\mathcal{L}})$, and the weighted mixed weak type inequality corresponding to Sawyer's conjecture for $\mathcal{V}_\varrho(e^{-t\mathcal{L}})$ are obtained. Furthermore, the quantitative restricted weak type $(p,p)$ bounds for $\mathcal{V}_\varrho(e^{-t\mathcal{L}})$ are also given with a new class of weights $A_{p}^{\rho,\theta,\mathcal{R}}$, which is larger than the classical $A_{p}^{\mathcal{R}}$ weights. Meanwhile, several characterizations of $A_{p,q,\alpha}^{\rho,\theta,\mathcal{R}}$ in terms of restricted weak type estimates of maximal operators are established.