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Irreversibility in models of macroevolution



Irreversibility in models of macroevolution



Cybernetics & Systems 32(3-4): 429-442, April-June



The canonical example of a self-organized critical system exhibiting power law properties is the sandpile model of Per Bak, and in its evolutionary extension, a model of macroevolution. Avalanches of events, be they sandslides or mutational activities, are caused by a domino effect. The system's emerging new property, called self-organized criticality, is a time symmetric one. However, if one tries not only to explain certain mechanisms of extinction events, then models of macroevolution have to take into account an apparent tendency, at least for some species, toward growing complexity. How to overcome the time symmetric situation is discussed in the following possible mechanisms, thereby maintaining, nevertheless, the relevant systems properties described by power laws.

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Accession: 010885702

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DOI: 10.1080/01969720151033599



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