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arXiv 2005.10946math.AP
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非线性阻尼$σ$ -发展方程的临界指数

The critical exponent for nonlinear damped $σ$-evolution equations

Marcello D'Abbicco, Marcelo Rempel Ebert

摘要:

在本文中,我们得到适当的最佳$L^p-L^q$衰减估计,$1\leq p\leq q\leq \infty$,$σ$ -发展方程,$σ>1$,结构阻尼和功率非线性$|u|^{1+α}$或$|u_t|^{1+α}$,\[ u_{tt}+(-Δ)^σu +(-Δ)^θu_t=\begin{cases} |u|^{1+α}, \\ |u_t|^{1+α}, \end{cases}\],其中$t\geq0$和$x\in\mathbb{R}^n$的解决方案。使用这些估计,我们可以解决在所谓的非有效情况下,$θ\in(σ/2,σ]$找到上述两个非线性问题的临界指数的问题。后者比有效情况$θ\in[0,σ/2)$更困难,因为解的渐近分布包括扩散分量和振荡分量。本文的创新之处在于将这两种成分分开处理,以忽略由这两种成分的相互作用所造成的衰减率损失。我们处理的振荡分量,通过本地化的低频率,振荡出现,在扩展的相空间。这种策略使我们能够恢复一个准标度属性,取代缺乏同质性的方程。

英文摘要:

In this paper, we derive suitable optimal $L^p-L^q$ decay estimates, $1\leq p\leq q\leq \infty$, for the solutions to the $σ$-evolution equation, $σ>1$, with structural damping and power nonlinearity $|u|^{1+α}$ or $|u_t|^{1+α}$, \[ u_{tt}+(-Δ)^σu +(-Δ)^θu_t=\begin{cases} |u|^{1+α}, \\ |u_t|^{1+α}, \end{cases}\] where $t\geq0$ and $x\in\mathbb{R}^n$. Using these estimates, we can solve the problem of finding the critical exponents for the two nonlinear problems above in the so-called non-effective case, $θ\in(σ/2,σ]$. This latter is more difficult than the effective case $θ\in[0,σ/2)$, since the asymptotic profile of the solution involves a diffusive component and an oscillating one. The novel idea in this paper consists in treating separately the two components to neglect the loss of decay rate created by the interplay of the two components. We deal with the oscillating component, by localizing the low frequencies, where oscillations appear, in the extended phase space. This strategy allows us to recover a quasi-scaling property which replaces the lack of homogeneity of the equation.

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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