Global counterexamples to uniqueness for a Calderón problem with $C^k$ conductivities

Thierry Daudé, Bernard Helffer, Niky Kamran +1

Let $\Omega \subset R^n$, $n\ge 3$, be a fixed smooth bounded domain, and let $\gamma$ be a smooth conductivity in $\overline{\Omega }$. Consider a non-zero frequency ${\lambda }_0$ which does not belong to…