Spectral Theory of Infinite Dimensional Dissipative Hamiltonian Systems

Authors

Christian Mehl, Volker Mehrmann, Michał Wojtylak

Abstract

The spectral theory for operator pencils and operator differential-algebraic equations is studied. Special focus is laid on singular operator pencils and three different concepts of singularity of operator pencils are introduced. The concepts are analyzed in detail and examples are presented that illustrate the subtle differences. It is investigated how these concepts are related to uniqueness of the underlying algebraic-differential operator equation, showing that, in general, classical results known from the finite dimensional case of matrix pencils and differential-algebraic equations do not prevail. The results are then studied in the setting of structured operator pencils arising in dissipative differential-algebraic equations. Here, unlike to the general infinite-dimensional case, the uniqueness of solutions to dissipative differential-algebraic operator equations is closely related to the singularity of the pencil.

Keywords

37l05, 37l20, 47d06, 93b28, 93c05, dissipative hamiltonian equation, operator differential-algebraic equation, regular operator pencil, singular operator pencil

Citation

• Journal: Journal of Dynamics and Differential Equations
• Year: 2026
• Volume: 38
• Issue: 2
• Pages: 551–577
• Publisher: Springer Science and Business Media LLC
• DOI: 10.1007/s10884-025-10420-y

BibTeX

@article{Mehl_2025,
  title={{Spectral Theory of Infinite Dimensional Dissipative Hamiltonian Systems}},
  volume={38},
  ISSN={1572-9222},
  DOI={10.1007/s10884-025-10420-y},
  number={2},
  journal={Journal of Dynamics and Differential Equations},
  publisher={Springer Science and Business Media LLC},
  author={Mehl, Christian and Mehrmann, Volker and Wojtylak, Michał},
  year={2025},
  pages={551--577}
}

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