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Deterministic versus stochastic aspects of superexponential population growth models

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  • Grosjean, Nicolas
  • Huillet, Thierry

Abstract

Deterministic population growth models with power-law rates can exhibit a large variety of growth behaviors, ranging from algebraic, exponential to hyperexponential (finite time explosion). In this setup, selfsimilarity considerations play a key role, together with two time substitutions. Two stochastic versions of such models are investigated, showing a much richer variety of behaviors. One is the Lamperti construction of selfsimilar positive stochastic processes based on the exponentiation of spectrally positive processes, followed by an appropriate time change. The other one is based on stable continuous-state branching processes, given by another Lamperti time substitution applied to stable spectrally positive processes.

Suggested Citation

  • Grosjean, Nicolas & Huillet, Thierry, 2016. "Deterministic versus stochastic aspects of superexponential population growth models," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 455(C), pages 27-37.
    • Handle: RePEc:eee:phsmap:v:455:y:2016:i:c:p:27-37
    DOI: 10.1016/j.physa.2016.02.063
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    References listed on IDEAS

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