Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-09-24
Phys. Rev. E 71, 025101(R) (2005)
Physics
Condensed Matter
Statistical Mechanics
4 pages (2 figs). Published in Physical Review E (Rapid Communications)
Scientific paper
10.1103/PhysRevE.71.025101
The appropriate description of fluctuations within the framework of evolutionary game theory is a fundamental unsolved problem in the case of finite populations. The Moran process recently introduced into this context [Nowak et al., Nature (London) 428, 646 (2004)] defines a promising standard model of evolutionary game theory in finite populations for which analytical results are accessible. In this paper, we derive the stationary distribution of the Moran process population dynamics for arbitrary $2\times{}2$ games for the finite size case. We show that a nonvanishing background fitness can be transformed to the vanishing case by rescaling the payoff matrix. In contrast to the common approach to mimic finite-size fluctuations by Gaussian distributed noise, the finite size fluctuations can deviate significantly from a Gaussian distribution.
Claussen Jens Christian
Traulsen Arne
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