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arXiv · 2610.41928

Inverse source problem for the stochastic fractional Helmholtz equation in inhomogeneous media

Dong Qiu·Xiang Xu·Yue Zhao
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Abstract

This paper is concerned with an inverse source problem for the stochastic fractional Helmholtz equation in a three-dimensional inhomogeneous medium. The source is modeled as real Gaussian spatial white noise with an unknown nonnegative strength function. For admissible frequencies, we establish well-posedness of the radiating solution in the distributional sense and show that it has a smooth representation outside the source region. For the inverse problem, by using two-point correlations of the field measured in an exterior open set at a single frequency, we prove a logarithmic stability estimate for recovering the source strength under an a priori Sobolev bound. As a uniform Hölder stability estimate is unavailable for the general admissible class, by assuming the difference between two source strengths has a fixed sign, we improve the stability to Hölder continuity with an optimal Hölder exponent. The analysis combines scattering theory and quantitative continuation for the fractional Laplacian using the Caffarelli-Silvestre extension.

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Dong Qiu, Xiang Xu, Yue Zhao. 2026-10-30. Inverse source problem for the stochastic fractional Helmholtz equation in inhomogeneous media. https://arxiv.org/abs/2610.41928

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