Abstract
Consider a uniform rooted Cayley tree with n vertices and let m cars arrive sequentially, independently, and uniformly on its vertices. Each car tries to park on its arrival node, and if the spot is already occupied, it drives towards the root of the tree and parks as soon as possible. Lackner and Panholzer (J. Combin. Theory Ser. A 142 (2016) 1–28) established a phase transition for this process when . In this work, we couple this model with a variant of the classical Erdős–Rényi random graph process. This enables us to describe the phase transition for the size of the components of parked cars using a modification of the multiplicative coalescent which we name the frozen multiplicative coalescent. The geometry of critical parked clusters is also studied. Those trees are very different from Bienaymé–Galton–Watson trees and should converge towards the growth-fragmentation trees canonically associated to the -stable process that already appeared in the study of random planar maps.
Funding Statement
We acknowledge support from ERC 740943 GeoBrown.
Acknowledgments
We thank Linxiao Chen, Armand Riera and especially Olivier Hénard for several motivating discussions during the elaboration of this work. We thank Svante Janson and Cyril Banderier for comments about the first version of this work. Last, but not least, we warmly thank the anonymous referee for a thorough reading of our paper and precious comments which were greatly appreciated.
Citation
Alice Contat. Nicolas Curien. "Parking on Cayley trees and frozen Erdős–Rényi." Ann. Probab. 51 (6) 1993 - 2055, November 2023. https://doi.org/10.1214/23-AOP1632
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