Refined long-time asymptotics for Fisher–KPP fronts

Refined long-time asymptotics for Fisher–KPP fronts
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Fisher-KPP 前沿的细化长时间渐近

DOI:
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发表时间:
2016
影响因子:
1.6
通讯作者:
L. Ryzhik
L. Ryzhik
中科院分区:
数学2区
文献类型:
--
作者:
J. Nolen;J. Roquejoffre;L. Ryzhik

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我们研究了一维Fisher-KPP方程,其初始条件[公式:见正文]与阶跃函数重合,但在紧集上除外。Bramson在[分枝布朗运动的最大位移,Comm.纯苹果。数学,1931(1978)531-581;《Kolmogorov方程的解到行波的收敛》(美国数学学会,普罗维登斯,RI,1983)]指出,如[公式:见文本],解收敛到位于位置[公式:见文本]的行波,其移位[公式:见文本]取决于[公式:见文本]。Ebert和Van Saarlos在[前线传播到不稳定状态:通向均匀平移拉动前线的普适代数收敛,物理。D-146(2000)1-99;前沿传播到不稳定态,物理。众议员[386(2003)29-222]更正了布拉姆森的转变,认为[公式:见正文]。在这里,我们证明了,对于任何[公式:请参阅文本],只要误差项的大小为[公式:请参阅文本],这一结果确实成立。这种渐近性的有趣之处在于,[公式:参见文本]项前面的系数不依赖于[公式:参见文本]。
We study the one-dimensional Fisher–KPP equation, with an initial condition [Formula: see text] that coincides with the step function except on a compact set. A well-known result of Bramson in [Maximal displacement of branching Brownian motion, Comm. Pure Appl. Math. 31 (1978) 531–581; Convergence of Solutions of the Kolmogorov Equation to Travelling Waves (American Mathematical Society, Providence, RI, 1983)] states that, as [Formula: see text], the solution converges to a traveling wave located at the position [Formula: see text], with the shift [Formula: see text] that depends on [Formula: see text]. Ebert and Van Saarloos have formally derived in [Front propagation into unstable states: Universal algebraic convergence towards uniformly translating pulled fronts, Phys. D 146 (2000) 1–99; Front propagation into unstable states, Phys. Rep. 386 (2003) 29–222] a correction to the Bramson shift, arguing that [Formula: see text]. Here, we prove that this result does hold, with an error term of the size [Formula: see text], for any [Formula: see text]. The interesting aspect of this asymptotics is that the coefficient in front of the [Formula: see text]-term does not depend on [Formula: see text].
DOI: 10.1007/s00220-016-2790-9
发表时间: 2016
影响因子: 2.4
作者:
Berestycki J
通讯作者: Berestycki J