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arXiv 1706.04745math.AP
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通过构造格林函数证明扩散方程内部传输问题的可解性

Solvability of interior transmission problem for the diffusion equation by constructing its Green function

Gen Nakamura, Haibing Wang

摘要:

考虑具有间断扩散系数的扩散方程反边值问题的内传递问题。通过构造内传播问题的格林函数,证明了内传播问题的唯一可解性。首先,我们利用大参数伪微分算子理论,在Laplace域中构造了一个局部参数方程,用于求解边界附近的内部传输问题。其次,通过分析Laplace域内局部参数的解析性,并在Laplace域内对其进行估计,利用拉普拉斯逆变换得到了原抛物型内传播问题的局部参数。最后,利用单位分解,对所有局部参数和扩散方程的基本解进行修补,生成抛物型内传输问题的全局参数,然后对全局参数进行补偿,得到格林函数。利用对偶性证明了格林函数的唯一性,从而得出了内传递问题的唯一可解性。本文首次构造了抛物型内透射问题的格林函数。该方法可应用于主动热成像和扩散方程模型的扩散光学层析成像,以识别未知夹杂物及其物理性质。

英文摘要:

Consider the interior transmission problem arising in inverse boundary value problems for the diffusion equation with discontinuous diffusion coefficients. We prove the unique solvability of the interior transmission problem by constructing its Green function. First, we construct a local parametrix for the interior transmission problem near the boundary in the Laplace domain, by using the theory of pseudo-differential operators with a large parameter. Second, by carefully analyzing the analyticity of the local parametrix in the Laplace domain and estimating it there, a local parametrix for the original parabolic interior transmission problem is obtained via the inverse Laplace transform. Finally, using a partition of unity, we patch all the local parametrices and the fundamental solution of the diffusion equation to generate a global parametrix for the parabolic interior transmission problem, and then compensate it to get the Green function by the Levi method. The uniqueness of the Green function is justified by using the duality argument, and then the unique solvability of the interior transmission problem is concluded. We would like to emphasize that the Green function for the parabolic interior transmission problem is constructed for the first time in this paper. It can be applied for active thermography and diffuse optical tomography modeled by diffusion equations to identify an unknown inclusion and its physical property.

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