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arXiv 1908.02602math.CA
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半群BMO和$A_p$的无偏估计

Dimension-free estimates for semigroup BMO and $A_p$

Leonid Slavin, Pavel Zatitskii

摘要:

设$K_t$是$\mathbb{R}^n.$上的热核或泊松核设$\mathcal{A}$代表配备二次核的BMO或$A_p,$ $1< p\le\infty.$我们建立了间隔$I\subset\mathbb{R}$上的类$\mathcal{A}$与其$K$ -版本$\mathbb{R}^n$上的$\mathcal{A}^K,$之间的以下传递:如果一个给定的积分泛函允许对$\mathcal{A}(I),$的估计,那么同样的估计对$\mathcal{A}^K(\mathbb{R}^n),$也成立,所有的勒贝格平均值都被$K$ -平均值取代。特别是,所有这些估计都是无量纲的。作为应用,通过热核,我们得到了球上${\rm BMO}(\mathbb{R}^n)$的弱维理论。特别是,我们表明,这个空间的约翰-尼伦伯格常数衰减与尺寸不快于$n^{-1/2}.$

英文摘要:

Let $K_t$ be either the heat or the Poisson kernel on $\mathbb{R}^n.$ Let $\mathcal{A}$ stand either for BMO equipped with the quadratic seminorm or for $A_p,$ $1< p\le\infty.$ We establish the following transference between the class $\mathcal{A}$ on an interval $I\subset\mathbb{R}$ and its $K$-version, $\mathcal{A}^K,$ on $\mathbb{R}^n$: If a given integral functional admits an estimate on $\mathcal{A}(I),$ then the same estimate holds for $\mathcal{A}^K(\mathbb{R}^n),$ with all Lebesgue averages replaced by $K$-averages. In particular, all such estimates are dimension-free. As an application, via the heat kernel, we obtain a weakly-dimensional theory for ${\rm BMO}(\mathbb{R}^n)$ on balls. In particular, we show that the John--Nirenberg constant of this space decays with dimension no faster than $n^{-1/2}.$

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