cea-02563985
https://cea.hal.science/cea-02563985
https://cea.hal.science/cea-02563985/document
https://cea.hal.science/cea-02563985/file/Ald1.pdf
arxiv:1902.08786v1
doi:10.1103/PhysRevE.99.052303
[SHS] Sciences de l'Homme et de la Société
[CEA] CEA - Commissariat à l'énergie atomique
[CNRS] CNRS - Centre national de la recherche scientifique
[EHESS] Ecole des Hautes Etudes en Sciences Sociales
[DSM-IPHT] IPHT
[DSV] Direction de la recherche fondamentale - sciences du vivant
[CEA-UPSAY] CEA - Université Paris-Saclay
[UNIV-PARIS-SACLAY] Université Paris-Saclay
[CEA-UPSAY-SACLAY] CEA-UPSAY-SACLAY
[CEA-DRF] Direction de Recherche Fondamentale
[TEST-HALCNRS] Collection test HAL CNRS
[GS-MATHEMATIQUES] Graduate School Mathématiques
[GS-PHYSIQUE] Graduate School Physique
Optimal geometry of transportation networks
Aldous, David
Barthelemy, Marc
[PHYS] Physics [physics]
[SHS] Humanities and Social Sciences
ART
Optimal networks
Spatial networks
Locational optimization
Subways
Motivated by the shape of transportation networks such as subways, we consider a distribution of points in the plane and ask for the network $G$ of given length $L$ that is optimal in a certain sense. In the general model, the optimality criterion is to minimize the average (over pairs of points chosen independently from the distribution) time to travel between the points, where a travel path consists of any line segments in the plane traversed at slow speed and any route within the subway network traversed at a faster speed. Of major interest is how the shape of the optimal network changes as $L$ increases. We first study the simplest variant of this problem where the optimization criterion is to minimize the average distance from a point to the network, and we provide some general arguments about the optimal networks. As a second variant we consider the optimal network that minimizes the average travel time to a central destination, and discuss both analytically and numerically some simple shapes such as the star network, the ring or combinations of both these elements. Finally, we discuss numerically the general model where the network minimizes the average time between all pairs of points. For this case, we propose a scaling form for the average time that we verify numerically. We also show that in the medium-length regime, as $L$ increases, resources go preferentially to radial branches and that there is a sharp transition at a value $L_c$ where a loop appears.
2019-05
2020-09-03
en
Physical Review E
American Physical Society (APS)