Stability for Time Dependent X-ray Transforms and Applications

TL;DR

This paper establishes a logarithmic stability estimate for the time dependent X-ray transform in Euclidean space, extending previous results and exploring applications to inverse problems like the Dirichlet-to-Neumann map.

Contribution

It extends known stability results for the time dependent X-ray transform to higher dimensions and applies these to inverse problems involving conformal factors.

Findings

Logarithmic stability estimate proven for the time dependent X-ray transform.

Extension of Begmatov's result from 2D to higher dimensions.

Inverse stability estimates for conformal factors under geometric conditions.

Abstract

We prove a logarithmic stability estimate for the time dependent X-ray transform on $\mathbb{R}_t^+\times\mathbb{R}^n$. To do so, we extend a known result by Begmatov for the stability of the time dependent X-ray transform in $\mathbb{R}^+_t\times\mathbb{R}^2$. We give some examples of stability and injectivity results in relationship to the Dirichlet-to-Neumann problem. In particular, under the Geometric Control Condtion, we derive inverse logarithmic stability estimates for time dependent conformal factors.