arXiv 0903.45362009-03math.FAmath.CA

RD-空间上的局部化BMO和BLO空间及其对Schr dinger算子的应用

Localized BMO and BLO Spaces on RD-Spaces and Applications to Schrödinger Operators

Dachun Yang, Dongyong Yang, Yuan Zhou

备注：: Commun. Pure Appl. Anal. (to appear)

摘要：

RD-空间${\mathcal X}$是Coifman和Weiss意义下的齐型空间，具有反向加倍条件在${\mathcal X}$中成立的附加性质。设$ρ$是RD-空间${\mathcal X}$上的容许函数.首先引入了局部化空间$\mathrm{BMO}_ρ({\mathcal X})$和$\mathrm{BLO}_ρ({\mathcal X})$，建立了它们的基本性质，包括$\mathrm{BMO}_ρ({\mathcal X})$的John-Nirenberg不等式，$\mathrm{BLO}_ρ({\mathcal X})$的几个等价刻画，以及这两个空间之间的一些关系.然后得到了自然极大算子、Hardy-Littlewood极大算子、与$ρ$相关的径向极大函数及其局部化形式、与$ρ$相关的Littlewood-Paley $g$ -函数在这些局部化空间上的有界性，其中Littlewood-Paley $g$ -函数和一些径向极大函数是通过核来定义的，这些核是在由薛定谔算子生成的半群上建模的。这些结果适用于广泛的设置，例如，薛定谔算子或退化薛定谔算子的${\mathbb R}^d$，或次拉普拉斯薛定谔算子海森堡群或连通和单连通幂零李群。

英文摘要：

An RD-space ${\mathcal X}$ is a space of homogeneous type in the sense of Coifman and Weiss with the additional property that a reverse doubling condition holds in ${\mathcal X}$. Let $ρ$ be an admissible function on RD-space ${\mathcal X}$. The authors first introduce the localized spaces $\mathrm{BMO}_ρ({\mathcal X})$ and $\mathrm{BLO}_ρ({\mathcal X})$ and establish their basic properties, including the John-Nirenberg inequality for $\mathrm{BMO}_ρ({\mathcal X})$, several equivalent characterizations for $\mathrm{BLO}_ρ({\mathcal X})$, and some relations between these spaces. Then the authors obtain the boundedness on these localized spaces of several operators including the natural maximal operator, the Hardy-Littlewood maximal operator, the radial maximal functions and their localized versions associated to $ρ$, and the Littlewood-Paley $g$-function associated to $ρ$, where the Littlewood-Paley $g$-function and some of the radial maximal functions are defined via kernels which are modeled on the semigroup generated by the Schrödinger operator. These results apply in a wide range of settings, for instance, to the Schrödinger operator or the degenerate Schrödinger operator on ${\mathbb R}^d$, or the sub-Laplace Schrödinger operator on Heisenberg groups or connected and simply connected nilpotent Lie groups.

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