arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.04323math.AP
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按年龄和突变的表型性状构成的群体中的浓度动态。校正器的收敛

Dynamics of concentration in a population structured by age and a phenotypic trait with mutations. Convergence of the corrector

Samuel Nordmann, Benoît Perthame

摘要:

我们研究了一个由年龄和一个表型特征组成的方程,该方程描述了一个受老龄化、个体间竞争和突变影响的种群的生长过程。这导致了更新方程,它出现在许多进化生物学问题中。我们的目标是精确地描述的解决方案的渐近行为,推断属性,说明这样的人口的浓度和自适应动态。这项工作是[38]的继续,其中考虑了没有突变的情况。当考虑突变时,有必要控制校正器,这是本文的主要新颖之处。我们的方法包括在定义中,由Hopf变换,一个有效的哈密顿在均匀化问题的哈密顿-雅可比方程。它的解带有极限密度的奇异部分(通常是狄拉克质量),校正器定义了权重。本文的主要新结果是仅利用Hamilton-Jacobi方程的黏性解的整体Lipschitz估计和半凸性估计,证明了校正项是一致有界的.建立了校正器所满足的极限方程。据我们所知,这是第一个例子,这样的界限可以证明在这样的背景下。

英文摘要:

We study an equation structured by age and a phenotypic trait describing the growth process of a population subject to aging, competition between individuals, and mutations. This leads to a renewal equation which occurs in many evolutionary biology problems. We aim to describe precisely the asymp-totic behavior of the solution, to infer properties that illustrate the concentration and adaptive dynamics of such a population. This work is a continuation of [38] where the case without mutations is considered. When mutations are taken into account, it is necessary to control the corrector which is the main novelty of the present paper. Our approach consists in defining, by the Hopf transform, a Hamilton-Jacobi equation with an effective Hamiltonian as in homogenization problems. Its solution carries the singular part of the limiting density (typically Dirac masses) and the corrector defines the weights. The main new result of this paper is to prove that the corrector is uniformly bounded, using only the global Lipschitz and semi-convexity estimates for the viscosity solution of the Hamilton-Jacobi equation. We also establish the limiting equation satisfied by the corrector. To the best of our knowledge, this is the first example where such bounds can be proved in such a context.

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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