Abstract:
For the one-dimensional Schrödinger operator with δδ-interactions, two-sided estimates of the distribution function of the eigenvalues and a criterion for the discreteness of the spectrum in terms of the Otelbaev function are obtained. A criterion for the resolvent of the Schrödinger operator to belong to the class Sp is established.
Keywords:
Schrödinger operator, semiboundedness below of the distribution functions of eigenvalues, discreteness of the spectrum of the Schrödinger operator, point interactions.
This publication is cited in the following 3 articles:
Robert Fulsche, Medet Nursultanov, Grigori Rozenblum, “Negative Eigenvalue Estimates for the 1D Schrödinger Operator with Measure-Potential”, Ann. Henri Poincaré, 2025
Fulsche R., Nursultanov M., “Spectral Theory For Sturm-Liouville Operators With Measure Potentials Through Otelbaev'S Function”, J. Math. Phys., 63:1 (2022), 012101
B. E. Kanguzhin, “Propagation of nonsmooth waves under singular perturbations of the wave equation”, Eurasian Math. J., 13:3 (2022), 41–50