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Cooperation under pressure: a phase diagram for altruism

  • IFISC Seminar

  • Konstantin Klemm
  • Bioinformatics University of Leipzig, Germany
  • Sept. 9, 2008, 3 p.m.
  • Sala Multiusos, Ed. Cientifíco-Técnico
  • Announcement file

Cooperation and altruistic behavior are enhanced in spatially structured
populations as compared with mean-field scenarios [Nowak and May, 1992].
In most studies of evolutionary game theory with spatial structure,
however, the size of the population is assumed to be constant. Here I
study a model where the population may vary in response to environmental
pressure p. I discuss two non-trivial effects. First, as increasing p
dilutes the population, cooperation becomes dominant and prevents
extinction for any non-zero efficiency of altruistic acts. Second, in a
large region of the parameter space, the increase of cooperators
overcompensates the decrease of defectors with growing p. Thus the overall
population size rises in response to increasing environmental pressure. I
obtain the phase diagram displaying these effects by stochastic
simulations and confirm it by solving the equations of pair approximation.



Coffee and cookies will be served 15 minutes before the start of the seminar


Contact details:

Damià Gomila

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