Magnetic Steklov problem on surfaces

TL;DR

This paper analyzes the spectral properties of the magnetic Dirichlet-to-Neumann map on surfaces, providing asymptotic expansions and exploring the inverse spectral problem, revealing what geometric information can be uniquely recovered from the spectrum.

Contribution

It offers precise spectral asymptotics for the magnetic Dirichlet-to-Neumann map on surfaces and investigates the inverse problem, highlighting differences from the non-magnetic case.

Findings

Spectral asymptotics are derived up to arbitrary polynomial power.

The spectrum can determine boundary length, number, and magnetic flux in favorable cases.

Examples show the spectrum may not detect the number of boundary components in general.

Abstract

The magnetic Dirichlet-to-Neumann map encodes the voltage-to-current measurements under the influence of a magnetic field. In the case of surfaces, we provide precise spectral asymptotics expansion (up to arbitrary polynomial power) for the eigenvalues of this map. Moreover, we consider the inverse spectral problem and from the expansion we show that the spectrum of the magnetic Dirichlet-to-Neumann map, in favourable situations, uniquely determines the number and the length of boundary components, the parallel transport and the magnetic flux along boundary components. In general, we show that the situation complicates compared to the case when there is no magnetic field. For instance, there are plenty of examples where the expansion does $\textit{not}$ detect the number of boundary components, and this phenomenon is thoroughly studied in the paper.