arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.07490math.AP
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具有年龄和表型特征的种群模型中的浓度动力学

Dynamics of concentration in a population model structured by age and a phenotypical trait

Samuel Nordmann, Benoît Perthame, Cécile Taing

摘要:

我们研究了一个数学模型,它描述了一个由年龄和表型特征组成的种群的生长过程,该种群受衰老、个体之间的竞争和罕见突变的影响。我们的目标是描述更新型方程的解的渐近行为,然后推导出说明这样的人口的自适应动态的属性。我们从一个简化的模型开始,通过丢弃突变的影响,这使我们能够介绍主要思想并陈述完整的结果。然后,我们讨论了一般模型及其局限性。我们的方法使用了一个正式的限制运营商的特征元素,依赖于模型的结构变量,并定义了一个有效的健身。然后,我们介绍了一种新的方法,减少了收敛性证明的熵估计,而不是估计的约束Hamilton-Jacobi方程。数值试验说明了理论,并显示了根据有效适应度选择最适合的性状。对于突变的问题,一个不寻常的哈密顿量出现了指数增长性,我们显示存在一个全球黏性解,使用一个不寻常的先验估计和一个新的唯一性结果。

英文摘要:

We study a mathematical model describing the growth process of a population structured by age and a phenotypical trait, subject to aging, competition between individuals and rare mutations. Our goals are to describe the asymptotic behaviour of the solution to a renewal type equation, and then to derive properties that illustrate the adaptive dynamics of such a population. We begin with a simplified model by discarding the effect of mutations, which allows us to introduce the main ideas and state the full result. Then we discuss the general model and its limitations. Our approach uses the eigenelements of a formal limiting operator, that depend on the structuring variables of the model and define an effective fitness. Then we introduce a new method which reduces the convergence proof to entropy estimates rather than estimates on the constrained Hamilton-Jacobi equation. Numerical tests illustrate the theory and show the selection of a fittest trait according to the effective fitness. For the problem with mutations, an unusual Hamiltonian arises with an exponential growth, for which we show existence of a global viscosity solution, using an uncommon a priori estimate and a new uniqueness result.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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