Issue
EPL
Volume 81, Number 2, January 2008
Article Number 28001
Number of page(s) 6
Section Interdisciplinary Physics and Related Areas of Science and Technology
DOI http://dx.doi.org/10.1209/0295-5075/81/28001
Published online 03 December 2007
EPL, 81 (2008) 28001
DOI: 10.1209/0295-5075/81/28001

Promote cooperation by localised small-world communication

Z.-G. Huang1, S.-J. Wang1, X.-J. Xu2 and Y.-H. Wang1

1  Institute of Theoretical Physics, Lanzhou University - Lanzhou Gansu 730000, China
2  Departamento de Física da Universidade de Aveiro - 3810-193 Aveiro, Portugal

huangzg03@lzu.cn
yhwang@lzu.edu.cn

received 5 October 2007; accepted in final form 6 November 2007; published January 2008
published online 3 December 2007

Abstract
The emergence and maintenance of cooperation within sizable groups of unrelated humans offer many challenges for our understanding. We propose that the humans' capacity of communication, such as how many and how far away the fellows can build up mutual communications, may affect the evolution of cooperation. We study this issue by means of the public goods game (PGG) with a two-layered network of contacts. Players obtain payoffs from five-person public goods interactions on a square lattice (the interaction layer). Also, they update strategies after communicating with neighbours in learning layer, where two players build up mutual communication with a power law probability depending on their spatial distance. Our simulation results indicate that the evolution of cooperation is indeed sensitive to how players choose others to communicate with, including the amount as well as the locations. The tendency of localised communication is proved to be a new mechanism to promote cooperation.

PACS
87.23.Kg - Dynamics of evolution.
02.50.Le - Decision theory and game theory.
87.23.Ge - Dynamics of social systems.

© EPLA 2008