Ojeda, Gabriel Berzunza and Holmgren, Cecilia
(2020)
Invariance principle for fragmentation processes derived from
conditioned stable Galton-Watson trees.
Bernoulli, 29 (4).
Text
2010.07880v3.pdf - Submitted version Download (410kB) | Preview |
Abstract
Aldous, Evans and Pitman (1998) studied the behavior of the fragmentation process derived from deleting the edges of a uniform random tree on $n$ labelled vertices. In particular, they showed that, after proper rescaling, the above fragmentation process converges as $n \rightarrow \infty$ to the fragmentation process of the Brownian CRT obtained by cutting-down the Brownian CRT along its skeleton in a Poisson manner. In this work, we continue the above investigation and study the fragmentation process obtained by deleting randomly chosen edges from a critical Galton-Watson tree $\mathbf{t}_{n}$ conditioned on having $n$ vertices, whose offspring distribution belongs to the domain of attraction of a stable law of index $\alpha \in (1,2]$. Our main results establish that, after rescaling, the fragmentation process of $\mathbf{t}_{n}$ converges as $n \rightarrow \infty$ to the fragmentation process obtained by cutting-down proportional to the length on the skeleton of an $\alpha$-stable L\'evy tree of index $\alpha \in (1,2]$. We further show that the latter can be constructed by considering the partitions of the unit interval induced by the normalized $\alpha$-stable L\'evy excursion with a deterministic drift studied by Miermont (2001). This extends the result of Bertoin (2000) on the fragmentation process of the Brownian CRT.
Item Type: | Article |
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Additional Information: | 30 pages, 5 figures |
Uncontrolled Keywords: | math.PR, math.PR |
Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
Depositing User: | Symplectic Admin |
Date Deposited: | 15 Jan 2024 16:24 |
Last Modified: | 15 Jan 2024 16:24 |
DOI: | 10.3150/22-bej1559 |
Related URLs: | |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/3177847 |