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arXiv 2305.06239math.AP
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具有退化迁移率的非局部Cahn-Hilliard方程:不可压缩极限与稳态收敛性

Nonlocal Cahn-Hilliard equation with degenerate mobility: Incompressible limit and convergence to stationary states

Charles Elbar, Benoît Perthame, Andrea Poiatti, Jakub Skrzeczkowski

AI总结:

本文首次在组织生长模型中引入非局部表面张力项,研究退化非局部Cahn-Hilliard方程的不可压缩极限,证明弱解长期收敛到常数稳态,且表面张力不阻碍肿瘤完全侵袭。

摘要:

组织生长的可压缩模型与流体力学的Hele-Shaw自由边界问题之间的联系近来引起了广泛关注。在大多数此类模型中,仅考虑了排斥力和平流项。为了考虑长程相互作用,我们首次通过添加一个非局部项引入表面张力效应,从而得到退化的非局部Cahn-Hilliard方程,并研究该系统的不可压缩极限。退化性和源项是主要困难。我们的方法依赖于通过De Giorgi迭代获得的一个新的L^∞估计,以及在存在源项的情况下对能量的均匀控制。我们还利用熵方法证明了任何弱解长期收敛到单一常数稳态,即使存在源项时也成立。我们的结果表明,非局部(甚至局部)Cahn-Hilliard方程中的表面张力不会阻止肿瘤完全侵袭整个区域。

英文摘要:

The link between compressible models of tissue growth and the Hele-Shaw free boundary problem of fluid mechanics has recently attracted a lot of attention. In most of these models, only repulsive forces and advection terms are taken into account. In order to take into account long range interactions, we include for the first time a surface tension effect by adding a nonlocal term which leads to the degenerate nonlocal Cahn-Hilliard equation, and study the incompressible limit of the system. The degeneracy and the source term are the main difficulties. Our approach relies on a new L^infty estimate obtained by De Giorgi iterations and on a uniform control of the energy despite the source term. We also prove the long-term convergence to a single constant stationary state of any weak solution using entropy methods, even when a source term is present. Our result shows that the surface tension in the nonlocal (and even local) Cahn-Hilliard equation will not prevent the tumor from completely invading the domain.

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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