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arXiv 1507.07971math.AP
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具有非线性双曲动力边界条件的强阻尼Wave Equations的吸引子

Attractors for Strongly Damped Wave Equations with Nonlinear Hyperbolic Dynamic Boundary Conditions

P. Jameson Graber, Joseph L. Shomberg

摘要:

建立了一类具有非线性双曲动力边界条件的强阻尼半线性波动方程的适定性。结果进行了一个参数的存在下,区分是否基本的操作是分析,$α>0$,或只有Gevrey类,$α=0$。我们建立了每个$α\in[0,1],$的全局吸引子的存在性,并证明了全局吸引子族是上连续的,如$α\rightarrow0.$。此外,对于每个$α\in[0,1]$,我们证明了弱指数吸引子的存在性。弱指数吸引子是相空间的弱拓扑中的有限维紧集。这一结果保证了在弱拓扑下,相应的全局吸引子也具有有限的分形维数,而且维数与扰动参数$α$无关.在这两种情况下,吸引子的非线性项的最小假设下发现。

英文摘要:

We establish the well-posedness of a strongly damped semilinear wave equation equipped with nonlinear hyperbolic dynamic boundary conditions. Results are carried out with the presence of a parameter distinguishing whether the underlying operator is analytic, $α>0$, or only of Gevrey class, $α=0$. We establish the existence of a global attractor for each $α\in[0,1],$ and we show that the family of global attractors is upper-semicontinuous as $α\rightarrow0.$ Furthermore, for each $α\in[0,1]$, we show the existence of a weak exponential attractor. A weak exponential attractor is a finite dimensional compact set in the weak topology of the phase space. This result insures the corresponding global attractor also possess finite fractal dimension in the weak topology; moreover, the dimension is independent of the perturbation parameter $α$. In both settings, attractors are found under minimal assumptions on the nonlinear terms.

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