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

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• 作者：Nuno Costa Dias^a ; ^c ; ^{ncdias@meo.pt" class="auth_mail" title="E-mail the corresponding author} ; Cristina Jorge^a ; ^c ; ^{cristina.goncalves.jorge@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Joã ; o Nuno Prata^b ; ^c ; ^{joao.prata@mail.telepac.pt" class="auth_mail" title="E-mail the corresponding author}
• 关键词：34L40 ; 81Q10 ; 81Q80 ; 34B09
• 刊名：Journal of Differential Equations
• 出版年：2016
• 出版时间：15 April 2016
• 年：2016
• 卷：260
• 期：8
• 页码：6548-6580
• 全文大小：470 K

文摘

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 δ^′${\delta }^{\prime }$ 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 potentials.