Application of approximation theory by nonlinear manifolds in Sturm-Liouville inverse problems

Details Application of approximation theory by nonlinear manifolds in Sturm-Liouville inverse problems Application of approximation theory by nonlinear manifolds in Sturm-Liouville inverse problems

2006-05-17

arxiv.org/abs/math-ph/0605050v1

Physics

Mathematical Physics

40 pages

Scientific paper

We give here some negative results in Sturm-Liouville inverse theory, meaning that we cannot approach any of the potentials with $m+1$ integrable derivatives on $\mathbb{R}^+$ by an $\omega$-parametric analytic family better than order of $(\omega\ln\omega)^{-(m+1)}$. Next, we prove an estimation of the eigenvalues and characteristic values of a Sturm-Liouville operator and some properties of the solution of a certain integral equation. This allows us to deduce from [Henkin-Novikova] some positive results about the best reconstruction formula by giving an almost optimal formula of order of $\omega^{-m}$.

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