From one-way streets to percolation on random mixed graphs - Archive ouverte HAL Access content directly
Journal Articles Physical Review E Year : 2021

From one-way streets to percolation on random mixed graphs

(1) , (1, 2)
1
2

Abstract

In most studies, street networks are considered as undirected graphs while one-way streets and their effect on shortest paths are usually ignored. Here, we first study the empirical effect of one-way streets in about $140$ cities in the world. Their presence induces a detour that persists over a wide range of distances and characterized by a non-universal exponent. The effect of one-ways on the pattern of shortest paths is then twofold: they mitigate local traffic in certain areas but create bottlenecks elsewhere. This empirical study leads naturally to consider a mixed graph model of 2d regular lattices with both undirected links and a diluted variable fraction $p$ of randomly directed links which mimics the presence of one-ways in a street network. We study the size of the strongly connected component (SCC) versus $p$ and demonstrate the existence of a threshold $p_c$ above which the SCC size is zero. We show numerically that this transition is non-trivial for lattices with degree less than $4$ and provide some analytical argument. We compute numerically the critical exponents for this transition and confirm previous results showing that they define a new universality class different from both the directed and standard percolation. Finally, we show that the transition on real-world graphs can be understood with random perturbations of regular lattices. The impact of one-ways on the graph properties were already the subject of a few mathematical studies, and our results show that this problem has also interesting connections with percolation, a classical model in statistical physics.
Fichier principal
Vignette du fichier
2103.10062.pdf (6.62 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

cea-03188105 , version 1 (01-04-2021)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Vincent Verbavatz, Marc Barthelemy. From one-way streets to percolation on random mixed graphs. Physical Review E , In press. ⟨cea-03188105⟩
34 View
101 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More