Renormalization group second‐order approximation for singularly perturbed nonlinear ordinary differential equations
Renormalization group second‐order approximation for singularly perturbed nonlinear ordinary differential equations
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奇摄动非线性常微分方程的重正化群二阶近似
DOI:
10.1002/mma.5107
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发表时间:
2018
影响因子:
2.9
通讯作者:
T. Stiehl
中科院分区:
文献类型:
--
作者:
A. Marciniak-Czochra;A. Mikelic;T. Stiehl
We consider a 2 time scale nonlinear system of ordinary differential equations. The small parameter of the system is the ratioϵof the time scales. We search for an approximation involving only the slow time unknowns and valid uniformly for all times at orderO(ϵ2). A classical approach to study these problems is Tikhonov's singular perturbation theorem. We develop an approach leading to a higher order approximation using the renormalization group (RG) method. We apply it in 2 steps. In the first step, we show that the RG method allows for approximation of the fast time variables by their RG expansion taken at the slow time unknowns. Next, we study the slow time equations, where the fast time unknowns are replaced by their RG expansion. This allows to rigorously show the second order uniform error estimate. Our result is a higher order extension of Hoppensteadt's work on the Tikhonov singular perturbation theorem for infinite times. The proposed procedure is suitable for problems from applications, and it is computationally less demanding than the classical Vasil'eva‐O'Malley expansion. We apply the developed method to a mathematical model of stem cell dynamics.
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影响因子:
4.3
作者:
Getto, Philipp;Marciniak-Czochra, Anna;Vivanco, Maria dM.
通讯作者:
Vivanco, Maria dM.
DOI:
10.1137/1.9781611970784
发表时间:
1995
期刊:
--
影响因子:
--
作者:
A. B. Vasil’eva;V. Butuzov;L. Kalachev
通讯作者:
A. B. Vasil’eva;V. Butuzov;L. Kalachev
DOI:
--
发表时间:
2000
期刊:
影响因子:
--
作者:
Zhen;Yan
通讯作者:
Yan
影响因子:
1.4
作者:
R. Temam;D. Wirosoetisno
通讯作者:
D. Wirosoetisno
影响因子:
4
作者:
Marciniak-Czochra, Anna;Stiehl, Thomas;Wagner, Wolfgang
通讯作者:
Wagner, Wolfgang