Issue
EPL
Volume 77, Number 3, February 2007
Article Number 38002
Number of page(s) 4
Section Interdisciplinary Physics and Related Areas of Science and Technology
DOI http://dx.doi.org/10.1209/0295-5075/77/38002
Published online 30 January 2007
EPL, 77 (2007) 38002
DOI: 10.1209/0295-5075/77/38002

Statistical dynamics of religions and adherents

M. Ausloos and F. Petroni

GRAPES, Université de Liège - B5, Sart Tilman, B-4000 Liège, Belgium


received 17 August 2006; accepted in final form 30 November 2006; published February 2007
published online 30 January 2007

Abstract
Religiosity is one of the most important sociological aspects of populations. All religions may evolve in their beliefs and adapt to the society developments. A religion is a social variable, like a language or wealth, to be studied like any other organizational parameter. Several questions can be raised, as considered in this study; e.g.: i) From a "macroscopic" point of view: How many religions exist at a given time? ii) From a "microscopic" viewpoint: How many adherents belong to one religion? Does the number of adherents increase or not, and how? No need to say that if quantitative answers and mathematical laws are found, agent-based models can be imagined to describe such non-equilibrium processes. It is found that empirical laws can be deduced and related to preferential attachment processes, like on an evolving network; we propose two different algorithmic models reproducing as well the data. Moreover, a population growth-death equation is shown to be a plausible modeling of evolution dynamics in a continuous-time framework. Differences with language dynamic competition are emphasized.

PACS
89.75.-k - Complex systems.
87.23.Ge - Dynamics of social systems.
89.65.-s - Social and economic systems.

© Europhysics Letters Association 2007