Publications Prof. Trunk

Publications of the employees

Publications of the Group

Results: 170
Created on: Wed, 27 Mar 2024 23:22:32 +0100 in 0.0726 sec


Gernandt, Hannes; Trunk, Carsten
On the parametric eigenvalue behavior of matrix pencils under rank one perturbations. - In: Proceedings in applied mathematics and mechanics, ISSN 1617-7061, Bd. 16 (2016), 1, S. 873-874

http://dx.doi.org/10.1002/pamm.201610425
Büttner, Florian; Trunk, Carsten
Limit-point/limit-circle classification of second-order differential operators arising in PT quantum mechanics. - In: Proceedings in applied mathematics and mechanics, ISSN 1617-7061, Bd. 16 (2016), 1, S. 871-872

http://dx.doi.org/10.1002/pamm.201610424
Škalikov, Andrej Andreevič; Trunk, Carsten
Ob ustojčivosti zamknutosti i samosoprjažennosti dlja 2 x 2 operator-matric. - Ilmenau : Technische Universität, Institut für Mathematik, 2016. - 1 Online-Ressource (6 Seiten). - (Preprint ; M16,07)

Consider an operator which is defined in Banach or Hilbert space by a 2x2 matrix with entries A, B, C, D which where linear operators and which are assumed to be unbounded. In the case when the operators C and B are relatively bounded with respect to the operators A and D, respectively, new conditions of the closeness or closability are obtained for the operator L. For the operator L acting in a Hilbert space the analogs of Rellich-Kato theorems on the stability of self-adjointness are obtained.



https://www.db-thueringen.de/receive/dbt_mods_00030580
Leben, Leslie;
Non-negative operators in Krein spaces and rank one perturbations. - Ilmenau : Universitätsverlag Ilmenau, 2016. - Online-Ressource (116 Seiten, 6.65 MB)
Technische Universität Ilmenau, Dissertation 2016

In der vorliegenden Arbeit werden eindimensionale Störungen von nichtnegativen Operatoren in Kreinräumen betrachtet. Dabei wird untersucht wie sich die Anzahl der Eigenwerte und deren Vielfachheit in einer Lücke des essentiellen Spektrums unter einer Störung ändern können. Zudem wird beschrieben wie sich an einem Eigenwert die Anzahl und die Länge der linear unabhängigen Jordanketten ändern können.



https://www.db-thueringen.de/receive/dbt_mods_00029981
Büttner, Florian; Trunk, Carsten
Limit-point/limit-circle classification of second-order differential operators arising in PT quantum mechanics. - Ilmenau : Technische Universität, Institut für Mathematik, 2016. - 1 Online-Ressource (6 Seiten). - (Preprint ; M16,03)
https://www.db-thueringen.de/receive/dbt_mods_00029270
Behrndt, Jussi; Schmitz, Philipp; Trunk, Carsten
Bounds on the non-real spectrum of a singular indefinite Sturm-Liouville operator on R. - Ilmenau : Technische Universität, Institut für Mathematik, 2016. - 1 Online-Ressource (4 Seiten). - (Preprint ; M16,05)

A simple explicit bound on the absolute values of the non-real eigenvalues of a singular indefinite Sturm-Liouville operator on the real line with the weight function sgn(&hahog;) and an integrable, continuous potential q is obtained.



https://www.db-thueringen.de/receive/dbt_mods_00029271
Gernandt, Hannes; Trunk, Carsten
On the parametric eigenvalue behavior of matrix pencils under rank one perturbations. - Ilmenau : Technische Universität, Institut für Mathematik, 2016. - 1 Online-Ressource (8 Seiten). - (Preprint ; M16,04)

We study the eigenvalues of rank one perturbations of regular matrix pencils depending linearly on a complex parameter. We prove properties of the corresponding eigenvalue sets including a convergence result as the parameter tends to infinity and an eigenvalue interlacing property for real valued pencils having real eigenvalues only.



https://www.db-thueringen.de/receive/dbt_mods_00029233
Ilchmann, Achim; Selig, Tilman; Trunk, Carsten
The Byrnes-Isidori form for infinite-dimensional systems. - In: SIAM journal on control and optimization, ISSN 1095-7138, Bd. 54 (2016), 3, S. 1504-1534

http://dx.doi.org/10.1137/130942413
Behrndt, Jussi; Möws, Roland; Trunk, Carsten
Eigenvalue estimates for operators with finitely many negative squares. - Ilmenau : Technische Universität, Institut für Mathematik, 2016. - 1 Online-Ressource (14 Seiten). - (Preprint ; M16,02)

Let A and B be selfadjoint operators in a Krein space. Assume that the re- solvent difference of A and B is of rank one and that the spectrum of A consists in some interval I of isolated eigenvalues only. In the case that A is an operator with finitely many negative squares we prove sharp estimates on the number of eigenvalues of B in the interval I. The general results are applied to singular indefinite Sturm-Liouville problems.



https://www.db-thueringen.de/receive/dbt_mods_00029046
Behrndt, Jussi; Leben, Leslie; Martínez Pería, Francisco; Möws, Roland; Trunk, Carsten
Sharp eigenvalue estimates for rank one perturbations of nonnegative operators in Krein spaces. - In: Journal of mathematical analysis and applications, ISSN 1096-0813, Bd. 439 (2016), 2, S. 864-895

http://dx.doi.org/10.1016/j.jmaa.2016.03.012