One-dimensional Schrödinger operators with singular potentials: A Schwartz distributional formulation

Costa Dias, Nuno.; Jorge, Cristina.; Prata, João Nuno.

http://hdl.handle.net/10400.26/53725

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Authors

Costa Dias, Nuno.

Jorge, Cristina.

Prata, João Nuno.

Abstract(s)

Using an extension of the Hörmander product of distributions, we obtain an intrinsic formulation of one-dimensional Schrödinger operators with singular potentials. This formulation is entirely defined in terms of standard Schwartz distributions and does not require (as some previous approaches) the use of more general distributions or generalized functions. We determine, in the new formulation, the action and domain of the Schrödinger operators with arbitrary singular boundary potentials. We also consider the inverse problem, and obtain a general procedure for constructing the singular (pseudo) potential that imposes a specific set of (local) boundary conditions. This procedure is used to determine the boundary operators for the complete four-parameter family of one-dimensional Schrödinger operators with a point interaction. Finally, the δ and potentials are studied in detail, and the corresponding Schrödinger operators are shown to coincide with the norm resolvent limit of specific sequences of Schrödinger operators with regular potential

Keywords

Schrödinger operators Singular potentials Point interactions Products of distributions Quantum systems with boundaries

URI

http://hdl.handle.net/10400.26/53725

Citation

Dias, N. C., Jorge, C., & Prata, J. N. (2016). One-dimensional Schrödinger operators with singular potentials: A Schwartz distributional formulation. Journal of Differential Equations, 260(8), 6548-6580.