Random self-similar trees and a hierarchical branching process
Random self-similar trees and a hierarchical branching process
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随机自相似树和分层分支过程
DOI:
10.1016/j.spa.2018.07.015
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发表时间:
2018
影响因子:
1.4
通讯作者:
Zaliapin, Ilya
中科院分区:
文献类型:
--
作者:
Kovchegov, Yevgeniy;Zaliapin, Ilya
We study self-similarity in random binary rooted trees. In a well-understood case of Galton–Watson trees, a distribution on a space of trees is said to be self-similar if it is invariant with respect to the operation of pruning, which cuts the tree leaves. This only happens for the critical Galton–Watson tree (a constant process progeny), which also exhibits other special symmetries. We extend the prune-invariance setup to arbitrary binary trees with edge lengths. In this general case the class of self-similar processes becomes much richer and covers a variety of practically important situations. The main result is construction of thehierarchical branching processesthat satisfy various self-similarity definitions (including mean self-similarity and self-similarity in edge-lengths) depending on the process parameters. Taking the limit of averaged stochastic dynamics, as the number of trajectories increases, we obtain a deterministic system of differential equations that describes the process evolution. This system is used to establish a phase transition that separates fading and explosive behavior of the average process progeny. We describe a class ofcritical Tokunagaprocesses that happen at the phase transition boundary. They enjoy multiple additional symmetries and include the celebrated critical binary Galton–Watson tree with independent exponential edge length as a special case. Finally, we discuss a duality between trees and continuous functions, and introduce a class ofextreme-invariantprocesses, constructed as the Harris paths of a self-similar hierarchical branching process, whose local minima has the same (linearly scaled) distribution as the original process.
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DOI:
--
发表时间:
2015
期刊:
arXiv.org
影响因子:
--
作者:
Yevgeniy Kovchegov;I. Zaliapin
通讯作者:
I. Zaliapin
DOI:
--
发表时间:
1997
期刊:
影响因子:
--
作者:
W. I. Newman;D. Turcotte;A. Gabrielov
通讯作者:
A. Gabrielov
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
S. Ethier;T. Kurtz
通讯作者:
T. Kurtz
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
I. Zaliapin;Yevgeniy Kovchegov
通讯作者:
Yevgeniy Kovchegov
DOI:
--
发表时间:
1993
期刊:
影响因子:
--
作者:
J. Gall
通讯作者:
J. Gall