Pruning of CRT-sub-trees

Pruning of CRT-sub-trees
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CRT子树的修剪

DOI:
10.1016/j.spa.2014.11.008
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发表时间:
2012-12
影响因子:
1.4
通讯作者:
Hui He
Hui He
中科院分区:
数学3区
文献类型:
--
作者:
Romain Abraham;Jean-François Delmas;Hui He

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我们研究了Abraham和Delmas(2012)在lsamvy树的离散Galton-Watson子树上开发的修剪过程,该子树是通过考虑以λ速率均匀选择连接根和叶的最小子树而获得的,参见Duquesne和Le Gall(2002)。随着λ的增加,树值过程已经被Duquesne和Winkel(2007)研究过。注意,我们有一个由两个参数索引的树值过程:剪枝参数θ和强度λ。我们的主要结果是:剪枝过程的构造和边缘,剪枝过程的表示(随着θ的增加而向前)和生长过程的描述(随着θ的减少而向后)以及上升时间(或向后过程的爆炸时间)和树在上升时间的分布。我们的结果的一个副产品是,由Abraham和Delmas(2012)以及Duquesne和Winkel(2007)独立引入的超临界lsamvy树是一致的。这项工作也与Abraham、Delmas和He(2012)研究的离散高尔顿-沃森树的修剪有关。
We study the pruning process developed by Abraham and Delmas (2012) on the discrete Galton–Watson sub-trees of the Lévy tree which are obtained by considering the minimal sub-tree connecting the root and leaves chosen uniformly at rate λ, see Duquesne and Le Gall (2002). The tree-valued process, as λ increases, has been studied by Duquesne and Winkel (2007). Notice that we have a tree-valued process indexed by two parameters: the pruning parameter θ and the intensity λ. Our main results are: construction and marginals of the pruning process, representation of the pruning process (forward in time that is as θ increases) and description of the growing process (backward in time that is as θ decreases) and distribution of the ascension time (or explosion time of the backward process) as well as the tree at the ascension time. A by-product of our result is that the super-critical Lévy trees independently introduced by Abraham and Delmas (2012) and Duquesne and Winkel (2007) coincide. This work is also related to the pruning of discrete Galton–Watson trees studied by Abraham, Delmas and He (2012).
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