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arXiv 1302.4253math.APmath-phmath.MP
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周期无限条上Laplace方程的加权索伯列夫空间

Weighted Sobolev spaces for the Laplace equation in periodic infinite strips

Vuk Milisic, Ulrich Razafison

摘要:

建立了加权索伯列夫空间(WSS)中Laplace算子的同构.这些空间类似于标准的索伯列夫空间,但它们被赋予了在无穷远处增长或衰减的权重。虽然在整个空间中得到了很好的确立,但这些加权结果并不适用于特定的周期性假设。这种问题出现在研究奇摄动域(粗糙度,筛,多孔介质等)。当放大一个单一的扰动模式时,人们通常会以一个无限条上的周期性问题集结束。我们提出了一个统一的框架,使这些问题的系统治疗。我们在我们的WSS中提供解的存在性和唯一性。这给出了一个精细的描述的解决方案的行为在无穷大,这是重要的多尺度上下文中。这些同构结果适用于任何权指数和任何正则性指数。然后,我们确定这些解决方案的卷积的格林函数(特定于周期性的无限条)和给定的数据。这个识别是有效的任何重量和任何正则性指数模一些调和多项式。

英文摘要:

This paper establishes isomorphisms for the Laplace operator in weighted Sobolev spaces (WSS). These spaces are similar to standard Sobolev spaces, but they are endowed with weights prescribing functions growth or decay at infinity. Although well established in the whole space, these weighted results do not apply in the specific hypothesis of periodicity. This kind of problem appears when studying singularly perturbed domains (roughness, sieves, porous media, etc). When zooming on a single perturbation pattern, one often ends with a periodic problem set on an infinite strip. We present a unified framework that enables a systematic treatment of such problems. We provide existence and uniqueness of solutions in our WSS. This gives a refined description of solutions behavior at infinity which is of importance in the mutli-scale context. These isomorphism results hold for any weight exponent and any regularity index. We then identify these solutions with the convolution of a Green function (specific to periodical infinite strips) and the given data. This identification is valid again for any weight and any regularity index modulo some harmonic polynomials.

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