Lie group action and stability analysis of stationary solutions for a free boundary problem modelling tumor growth

Lie group action and stability analysis of stationary solutions for a free boundary problem modelling tumor growth
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肿瘤生长建模自由边界问题平稳解的李群作用和稳定性分析

DOI:
10.1016/j.jde.2008.10.014
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发表时间:
2007-12
影响因子:
2.4
通讯作者:
Shangbin Cui
Shangbin Cui
中科院分区:
数学2区
文献类型:
--
作者:
Shangbin Cui

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在本文中,我们研究了一个模拟肿瘤生长的自由边界问题解的渐近行为。我们首先建立了具有李群作用的Banach空间中的微分方程解的一般结果,它将解映射为新的解。在不假定定义方程的空间是DA(θ)型或DA(θ,∞)型的情况下,证明了线性化算子的谱在一定的假设下存在中心流形。利用这一一般结果和对定常自由边界问题线性化的谱的精细分析,我们证明了当表面张力系数γ大于阈值γ*时,如果常数c足够小,则唯一定常解是渐近稳定的,而如果γ<γ*,则定常解是不稳定的。
In this paper we study asymptotic behavior of solutions for a free boundary problem modelling tumor growth. We first establish a general result for differential equations in Banach spaces possessing a Lie group action which maps a solution into new solutions. We prove that a center manifold exists under certain assumptions on the spectrum of the linearized operator without assuming that the space in which the equation is defined is of either DA(θ) or DA(θ,∞) type. By using this general result and making delicate analysis of the spectrum of the linearization of the stationary free boundary problem, we prove that if the surface tension coefficient γ is larger than a threshold value γ*then the unique stationary solution is asymptotically stable modulo translations, provided the constant c is sufficiently small, whereas if γ<γ*then this stationary solution is unstable.
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