Local rigidity of conformally Euclidean metrics for the anisotropic Helmholtz equation at fixed energy
Year: 2026
Type: preprint
Abstract: We prove local rigidity of smooth conformally Euclidean metrics $g_0$ on smooth compact domains $M\subset\mathbb{R}^n$, $n\ge3$, for the anisotropic Helmholtz equation $(-Δ_g -k^2)u =0$ at a fixed energy $k^2>0$ which is not a Dirichlet eigenvalue of $-Δ_{g_0}$ in $M$. Any smooth metric sufficiently close to $g_0$ in $H^s(M)$, with integer $s>n/2+1$, and having the same Dirichlet-to-Neumann map, is its pullback by a smooth diffeomorphism fixing the boundary pointwise. The proof uses a Helmholtz embedding to fix the gauge and a compactness argument together with a characterization of the kernel of the linearization.
Source: arXiv (Cornell University)
Authors: Muñoz-Thon, Sebastián, Stefanov, Plamen
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7223063508