Spectral properties of non-selfadjoint Sturm-Liouville operator equation on the real axis

Authors : Gökhan MUTLU, Esra KIR ARPAT

Pages : 1686-1694

Doi:10.15672/hujms.577991

View : 23 | Download : 11

Publication Date : 2020-10-06

Article Type : Research Paper

Abstract : In this paper, we analyze the non-selfadjoint Sturm-Liouville operator $L$ defined in the Hilbert space $L_{2}insert ignore into journalissuearticles values(\mathbb{R},H);$ of vector-valued functions which are strongly-measurable and square-integrable in $ \mathbb{R} $. $L$ is defined \[Linsert ignore into journalissuearticles values(y);=-y``+Qinsert ignore into journalissuearticles values(x);y,\, x\in\mathbb{R} \] for every $ y \in L_{2}insert ignore into journalissuearticles values(\mathbb{R},H); $ where the potential $Qinsert ignore into journalissuearticles values(x);$ is a non-selfadjoint, completely continuous operator in a separable Hilbert space $H$ for each $x\in \mathbb{R}.$ We obtain the Jost solutions of this operator and examine the analytic and asymptotic properties. Moreover, we find the point spectrum and the spectral singularities of $ L $ and also obtain the sufficient condition which assures the finiteness of the eigenvalues and spectral singularities of $ L $.
Keywords : Sturm Liouville operator equation, eigenvalues, spectral singularities, operator coefficient, non selfadjoint operators