一类具有竞争非局部非线性和吸收的自由边界问题整体解的爆破和衰减

IF 0.3 Q4 MATHEMATICS
Hoang Huy Truong, Dung Tien Nguyen, Hoang-Hung Vo
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引用次数: 0

摘要

本文研究了具有竞争非局部非线性和吸收$$\begin{aligned} u_t(t,x) = u_{xx}(t,x) + u^{p}(t,x) \int _0^{s(t)}u^{q}(t,x)dx -\gamma u^\alpha (t,x), t>0,\ 0<x <s(t), \end{aligned}$$(1)的自由边界抛物型方程的爆破解和全局解的性质,其中\(q, \alpha \ge 1\), \(p=0\)或\(p\ge 1\)和\(\gamma > 0\)为给定常数。本研究的动机来自于Abdelhedi和Zaag: J.微分方程272,1-45,(2021);Souplet: SIAM J. Math。《论文集》29,1301-1334,(1998);周和林:J. Funct。[中文文摘,262,3409-3429,(2012)]源于对许多物理和生物现象的研究,如种群动力学、燃烧理论、二元混合物的相分离、核反应堆动力学理论……我们首先利用[Du et al.: Math]中引入的“扩展技巧”证明了解的局部存在性、唯一性和稳定性。Ann. 386(3-4), 2061-2106, (2023);王和杜:离散连续。Dyn系统爵士。生物通报26(4),2201-2238,(2021)]。其次,通过改进[Souplet: SIAM J. Math]中使用的比较原理。《论文集》29,1301-1334,(1998);周和林:J. Funct。[j] .[数学与工程学报,262,3409-3429,(2012)],我们找到了用幂系数和初始数据表征(1)的爆破解和全局解的尖锐判据。我们进一步证明了初始数据存在一个阈值,该阈值决定了爆炸解、全局快速解或全局慢解是否发生,并找到了两种不同情况下爆炸解存在时间的上界\(\alpha >1\)和\(\alpha =1\)。我们的证明主要是在比较原理的基础上,改进了前人的一些技术,结合了处理微分不等式的新思想和非局部半线性抛物方程的统一局部存在理论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Blow-up and Decay of Global Solutions for a Free Boundary Problem with Competing Nonlocal Nonlinearity and Absorption

In this paper, we are concerned with the characterization of the blow-up and global solutions for free boundary parabolic equation with competing nonlocal nonlinearity and absorption

$$\begin{aligned} u_t(t,x) = u_{xx}(t,x) + u^{p}(t,x) \int _0^{s(t)}u^{q}(t,x)dx -\gamma u^\alpha (t,x), t>0,\ 0<x <s(t), \end{aligned}$$
(1)

where \(q, \alpha \ge 1\), \(p=0\) or \(p\ge 1\) and \(\gamma > 0\) are given constants. This study is motivated from the works [Abdelhedi and Zaag: J. Differential Equations 272, 1–45, (2021); Souplet: SIAM J. Math. Anal. 29, 1301–1334, (1998); Zhou and Lin: J. Funct. Anal. 262, 3409–3429, (2012)] arisen from the investigation of many physical and biological phenomena such as population dynamics, combustion theory, phase separation in binary mixtures, theory of nuclear reactor dynamics... We first prove the local existence, uniqueness and stability of solution thanks to the “extension trick" introduced in [Du et al.: Math. Ann. 386(3-4), 2061–2106, (2023); Wang and Du: Discrete Contin. Dyn. Syst. Ser. B 26(4), 2201–2238, (2021)]. Second, by improving the comparison principle used in [Souplet: SIAM J. Math. Anal. 29, 1301–1334, (1998); Zhou and Lin: J. Funct. Anal. 262, 3409–3429, (2012)], we find a sharp criterion characterizing the blow-up and global solutions of (1) in term of power coefficients and initial data. We further show that there exists a threshold for the initial data that determines whether blow-up, global fast, or global slow solutions occur and find an upper bound for the existence time of blow-up solutions in two different cases \(\alpha >1\) and \(\alpha =1\). Our proofs are mainly based on the comparison principle by improving several techniques in previous works, combined new idea to handle differential inequalities and unified local existence theory for nonlocal semilinear parabolic equations.

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来源期刊
CiteScore
0.90
自引率
0.00%
发文量
23
期刊介绍: Acta Mathematica Vietnamica is a peer-reviewed mathematical journal. The journal publishes original papers of high quality in all branches of Mathematics with strong focus on Algebraic Geometry and Commutative Algebra, Algebraic Topology, Complex Analysis, Dynamical Systems, Optimization and Partial Differential Equations.
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