与满足Davies-Gaffney估计的算子相伴的Orlicz-Hardy空间
Orlicz-Hardy Spaces Associated with Operators Satisfying Davies-Gaffney Estimates
摘要：
设${\mathcal X}$是具有加倍测度的度量空间，$L$是$L^2({\mathcal X})$中满足Davies-Gaffney估计的非负自伴算子，$ω$是$(0,\infty)$上的凹函数，且$p_ω\in (0, 1]$和$ρ(t)={t^{-1}}/ω^{-1}(t^{-1})$对所有的$H_{ω,L}({\mathcal X})$都是严格下型的.建立了$H_{ω,L}({\mathcal X})$与$\mathrm{BMO}_{ρ,L}({\mathcal X})$之间的对偶关系，作为推论，得到了空间${\mathop\mathrm{BMO}_{ρ,L}(\mathcal X)}$的$ρ$-Carleson测度刻画.给出了$H_{ω,L}({\mathcal X})$的一些特征，包括原子和分子的特征以及与Poisson半群相关的Lusin面积函数的特征.设${\mathcal X}={\mathbb R}^n$和$ L=-Δ+V$为薛定谔算子，其中$V\in L^1_{\mathrm{\,loc\,}}({\mathbb R}^n)$是非负势。作为应用，证明了Riesz变换$\nabla L^{-1/2}$是从$H_{ω,L}({{\mathbb R}^n})$到$L(ω)$有界的;此外，如果存在$q_1,\,q_2\in (0,\infty)$使得$q_1<1<q_2$和{$[ω(t^{q_2})]^{q_1}$ }是$(0,\infty)$上的凸函数，那么Orlicz-Hardy空间$H_{ω,L}({{\mathbb R}^n})$的几个特征，用Lusin面积函数，非切极大函数，径向极大函数，原子和分子都被得到了。所有这些结果都是新的，即使当$ω(t)=t^p$为所有$t\in (0,\infty)$和$p\in (0,1)$。
英文摘要：
Let ${\mathcal X}$ be a metric space with doubling measure, $L$ a nonnegative self-adjoint operator in $L^2({\mathcal X})$ satisfying the Davies-Gaffney estimate, $ω$ a concave function on $(0,\infty)$ of strictly lower type $p_ω\in (0, 1]$ and $ρ(t)={t^{-1}}/ω^{-1}(t^{-1})$ for all $t\in (0,\infty).$ The authors introduce the Orlicz-Hardy space $H_{ω,L}({\mathcal X})$ via the Lusin area function associated to the heat semigroup, and the BMO-type space ${\mathop\mathrm{BMO}_{ρ,L}(\mathcal X)}$. The authors then establish the duality between $H_{ω,L}({\mathcal X})$ and $\mathrm{BMO}_{ρ,L}({\mathcal X})$; as a corollary, the authors obtain the $ρ$-Carleson measure characterization of the space ${\mathop\mathrm{BMO}_{ρ,L}(\mathcal X)}$. Characterizations of $H_{ω,L}({\mathcal X})$, including the atomic and molecular characterizations and the Lusin area function characterization associated to the Poisson semigroup, are also presented. Let ${\mathcal X}={\mathbb R}^n$ and $ L=-Δ+V$ be a Schrödinger operator, where $V\in L^1_{\mathrm{\,loc\,}}({\mathbb R}^n)$ is a nonnegative potential. As applications, the authors show that the Riesz transform $\nabla L^{-1/2}$ is bounded from $H_{ω,L}({{\mathbb R}^n})$ to $L(ω)$; moreover, if there exist $q_1,\,q_2\in (0,\infty)$ such that $q_1<1<q_2$ and {\normalsize$[ω(t^{q_2})]^{q_1}$} is a convex function on $(0,\infty)$, then several characterizations of the Orlicz-Hardy space $H_{ω,L}({{\mathbb R}^n})$, in terms of the Lusin-area functions, the non-tangential maximal functions, the radial maximal functions, the atoms and the molecules, are obtained. All these results are new even when $ω(t)=t^p$ for all $t\in (0,\infty)$ and $p\in (0,1)$.
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