Increasing stability in the n‐dimensional inverse source problem with multifrequencies

Abstract

In this paper, we show for the first time the increasing stability of the inverse source problem for the n‐dimensional Helmholtz equation at multiple wave numbers, which is different from the two‐ or three‐dimensional Helmholtz equation. In addition, we develop a new, unified approach to study increasing stability in any dimension. The method is based on the Fourier transform and explicit bounds for analytic continuation.