Spectral Theory of Operator Pencils, Hermite-Biehler Functions, and their Applications
- 412pages
- 15 heures de lecture
The theoretical part of this monograph examines the distribution of the spectrum of operator polynomials, particularly focusing on quadratic operator polynomials with discrete spectra. The second part addresses applications, highlighting standard spectral problems in Hilbert spaces, typically expressed as A-λI for an operator A. Self-adjoint operators are of particular interest due to their real spectra, which are crucial in many theoretical physics and engineering problems. However, numerous issues, especially vibration problems with boundary conditions that depend on the spectral parameter, involve operator polynomials that are quadratic in the eigenvalue parameter and feature self-adjoint operator coefficients. While the spectra of these operator polynomials may not always be real, they still reveal specific patterns. The distribution of these spectra is the central theme of this volume. It also considers inverse problems for certain classes of quadratic operator polynomials and explores the connection between their spectra and generalized Hermite-Biehler functions. Numerous applications are investigated, including the Regge problem, damped vibrations of smooth strings, Stieltjes strings, beams, star graphs of strings, and quantum graphs. Some chapters provide advanced background material, complete with detailed proofs, and only basic properties of operators in Hilbert spaces and well-known results from complex analysis are
![Über Randeigenwertprobleme für Differentialgleichungen mit der charakteristischen Gleichung λp(λl - 1)= 0 [pl]](https://rezised-images.knhbt.cz/1920x1920/0.jpg)
