An inverse anisotropic conductivity problem induced bytwisting a homogeneous cylindrical domain

We consider the inverse problem of determining the unknown function $α: \mathbb{R} \rightarrow \mathbb{R}$ from the DN map associated to the operator $\mbox{div}(A(x',α(x\_3))\nabla \cdot)$ acting in the infinite straight cylindrical waveguide $Ω=ω\times \mathbb{R}$, where $ω$ is a bounded domain of $\mathbb{R}^2$. Here $A=(A\_{ij}(x))$, $x=(x',x\_3) \in Ω$, is a matrix-valued metric on $Ω$ obtained by straightening a twisted waveguide. This inverse anisotropic conductivity problem remains generally open, unless the unknown function $α$ is assumed to be constant. In this case we prove Lipschitz stability in the determination of $α$ from the corresponding DN map. The same result remains valid upon substituting a suitable approximation of the DN map, provided the function $α$ is sufficiently close to some {\it a priori} fixed constant.

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