We consider Schrödinger operators on the line with potentials that are periodic with respect to the coordinate variable and real analytic with respect to the energy variable. We prove that if the imaginary part of the potential is bounded in the right half-plane, then the high energy spectrum is real, and the corresponding asymptotics are determined. Moreover, the Dirichlet and Neumann problems are considered. These results are used to analyze the good Boussinesq equation.

Original languageEnglish
Pages (from-to)638-664
Number of pages27
JournalJournal of Differential Equations
Publication statusPublished - 15 Jan 2021

Scopus subject areas

  • Analysis
  • Applied Mathematics

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