Absolutely continuous spectrum for one-dimensional Schrödinger operators with slowly decaying potentials: Some optimal results

Christ, Michael¹ ; Kiselev, Alexander²

¹ Department of Mathematics, University of California, Berkeley, California 94720
² Department of Mathematics, University of Chicago, 5734 University Avenue, Chicago, Illinois 60637

Journal of the American Mathematical Society, Tome 11 (1998) no. 4, pp. 771-797

Résumé

The absolutely continuous spectrum of one-dimensional Schrödinger operators is proved to be stable under perturbation by potentials satisfying mild decay conditions. In particular, the absolutely continuous spectra of free and periodic Schrödinger operators are preserved under all perturbations $V(x)$ satisfying $|V(x)|\leq C(1+|x|)^{-\alpha },$ $\alpha >\frac {1}{2}.$ This result is optimal in the power scale. Slightly more general classes of perturbing potentials are also treated. A general criterion for stability of the absolutely continuous spectrum of one-dimensional Schrödinger operators is established. In all cases analyzed, the main term of the asymptotic behavior of the generalized eigenfunctions is shown to have WKB form for almost all energies. The proofs rely on maximal function and norm estimates, and on almost everywhere convergence results for certain multilinear integral operators.

Détail

DOI : 10.1090/S0894-0347-98-00276-8

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