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arXiv · 2311.18734

Structural results for the Tree Builder Random Walk

Janos Engländer·Giulio Iacobelli·Gábor Pete·Rodrigo Ribeiro
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Abstract

We study the Tree Builder Random Walk: a randomly growing tree, built by a walker as she is walking around the tree. Namely, at each time $n$, she adds a leaf to her current vertex with probability $p_n \asymp n^{-\gamma}$, $\gamma\in (2/3,1]$, then moves to a uniform random neighbor on the possibly modified tree. We show that the tree process at its growth times, after a random finite number of steps, can be coupled to be identical to the Barab\'asi-Albert preferential attachment tree model. Thus, our TBRW-model is a local dynamics giving rise to the BA-model. The coupling also implies that many properties known for the BA-model, such as diameter and degree distribution, can be directly transferred to our TBRW-model, extending previous results.

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Janos Engländer, Giulio Iacobelli, Gábor Pete, Rodrigo Ribeiro. 2023-11-30. Structural results for the Tree Builder Random Walk. https://arxiv.org/abs/2311.18734

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