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arXiv · 2409.01048

Boundedness of discounted tree sums

Elie Aïdékon·Yueyun Hu·Zhan Shi
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Abstract

Let $(V(u),\, u\in \mathcal{T})$ be a (supercritical) branching random walk and $(η_u,\,u\in \mathcal{T})$ be marks on the vertices of the tree, distributed in an i.i.d.\ fashion. Following Aldous and Bandyopadhyay \cite{AB05}, for each infinite ray $ξ$ of the tree, we associate the {\it discounted tree sum} $D(ξ)$ which is the sum of the $e^{-V(u)}η_u$ taken along the ray. The paper deals with the finiteness of $\sup_ξD(ξ)$. To this end, we study the extreme behaviour of the local time processes of the paths $(V(u),\,u\in ξ)$. It answers a question of Nicolas Curien, and partially solves Open Problem 31 of Aldous and Bandyopadhyay \cite{AB05}. We also present several open questions.

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Elie Aïdékon, Yueyun Hu, Zhan Shi. 2025-06-06. Boundedness of discounted tree sums. https://arxiv.org/abs/2409.01048

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