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arXiv 1407.5563math.PR
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布朗树水平集的一致Hausdorff测度

Uniform Hausdorff measure of the level sets of the Brownian tree

Xan Duhalde

摘要:

令$(\mathcal{T},d)$是根$ρ$由布朗偏移编码的随机实树。因此,$(\mathcal{T},d)$是(标准化)Aldous CRT \cite{AldousI}(参见Le Gall \cite{LG91})。$\mathcal{T}$的$a$级别集是$\mathcal{T}$中距离根点$a$的所有点的集合$\mathcal{T}(a)$。我们从Duquesne和Le Gall \cite{DuLG06}知道,对于任何固定的$a\in (0, \infty)$,由布朗漂移的$a$处的局部时在$\mathcal{T}(a)$上诱导的测度$\ell^a$等于$\mathcal{T}$中的Hausdorff测度,直到一个乘法常数,其中规范函数$g(r)= r \log\log1/r$限于$\mathcal{T}(a)$。根据Perkins \cite{Per88,Per89}关于超布朗运动的一个结果,本文证明了一个在$a$中几乎必然一致成立的更精确的命题,并指定了乘法常数.也就是说,我们证明了几乎必然对任何$a\in (0, \infty)$,$\ell^a(\cdot) = \frac{1}{2} \mathscr{H}_g (\, \cdot \, \cap \mathcal{T}(a))$,其中$\mathscr{H}_g$代表$g$-Hausdorff测度.

英文摘要:

Let $(\mathcal{T},d)$ be the random real tree with root $ρ$ coded by a Brownian excursion. So $(\mathcal{T},d)$ is (up to normalisation) Aldous CRT \cite{AldousI} (see Le Gall \cite{LG91}). The $a$-level set of $\mathcal{T}$ is the set $\mathcal{T}(a)$ of all points in $\mathcal{T}$ that are at distance $a$ from the root. We know from Duquesne and Le Gall \cite{DuLG06} that for any fixed $a\in (0, \infty)$, the measure $\ell^a$ that is induced on $\mathcal{T}(a)$ by the local time at $a$ of the Brownian excursion, is equal, up to a multiplicative constant, to the Hausdorff measure in $\mathcal{T}$ with gauge function $g(r)= r \log\log1/r$, restricted to $\mathcal{T}(a)$. As suggested by a result due to Perkins \cite{Per88,Per89} for super-Brownian motion, we prove in this paper a more precise statement that holds almost surely uniformly in $a$, and we specify the multiplicative constant. Namely, we prove that almost surely for any $a\in (0, \infty)$, $\ell^a(\cdot) = \frac{1}{2} \mathscr{H}_g (\, \cdot \, \cap \mathcal{T}(a))$, where $\mathscr{H}_g$ stands for the $g$-Hausdorff measure.

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