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arXiv 2006.02693math.FA
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加权齐次树上的BMO空间

BMO spaces on weighted homogeneous trees

Laura Arditti, Anita Tabacco, Maria Vallarino

摘要:

我们考虑一个无限同构树$\mathcal V$,它具有定义在图上的通常度量$d$和一个加权测度$μ$ .度量测度空间$(\mathcal V,d,μ)$是非加倍的且指数增长性的,因此经典的Hardy空间和$BMO$空间的理论在这种情况下不适用.在$(\mathcal V,d,μ)$上引入了一个空间$BMO(μ)$,并研究了它的一些性质.特别证明了$BMO(μ)$可以与Hardy空间$H^1(μ)$的对偶相一致,并研究了与$BMO(μ)$相关的尖锐极大函数.

英文摘要:

We consider an infinite homogeneous tree $\mathcal V$ endowed with the usual metric $d$ defined on graphs and a weighted measure $μ$. The metric measure space $(\mathcal V,d,μ)$ is nondoubling and of exponential growth, hence the classical theory of Hardy and $BMO$ spaces does not apply in this setting. We introduce a space $BMO(μ)$ on $(\mathcal V,d,μ)$ and investigate some of its properties. We prove in particular that $BMO(μ)$ can be identified with the dual of a Hardy space $H^1(μ)$ introduced in a previous work and we investigate the sharp maximal function related with $BMO(μ)$.

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