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arXiv · 2605.20899

Instability estimates for the recovery of absorption in the diffusive regime of radiative transfer

Elena Demattè·Alessandro Felisi·Angkana Rüland·Juan J. L. Velázquez
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Abstract

We revisit the instability properties of the recovery of the absorption coefficient for the radiative transfer equation in the diffusive regime. To this end, we develop a rather robust framework building on [Koch-Rüland-Salo, 2021] which allows us to deal with nonlinear critical stability transition phenomena. In particular, this permits us to consider rather general geometries based on the identification of compression properties of the forward operator. Given the albedo operator as the measurement data, we show that in the regime of vanishing Knudsen number there is a transition from Hölder to logarithmic stability in the inverse problem for the radiative transfer equation. As a central ingredient, we rely on suitable a priori estimates for the radiative transfer equation which we deduce by building on the strategy from [Demattè-Velázquez, 2025].

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Elena Demattè, Alessandro Felisi, Angkana Rüland, Juan J. L. Velázquez. 2026-05-20. Instability estimates for the recovery of absorption in the diffusive regime of radiative transfer. https://arxiv.org/abs/2605.20899

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