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Spectrum and Spectral Singularities of Quadratic Pencil of Klein-Gordon Operators with General Boundary Condition

Genel Sınır Koşulu ile Verilen Quadratic Pencil Klein-Gordon Operatörünün Spectrumu ve Spectral Tekillikleri

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Abstract (2. Language): 
Bu çalışmada L2 (R+) uzayında = ′′+( ) − ∈ = ( ∞) + ( ) ( ) , x 0, 2 l y y λ Q x y R denklemi ve ∫ ∞ + ′ − = 0 K(x)y(x)dx αy (0) βy(0) 0 genel sınır koşulu ile verilen Quadratic Pencil Klein-Gordon L operatörünün spektral tekillikleri ve spektrumu incelenmiştir. Burada K ve Q kompleks değerli fonksiyonlar, ( ) K ∈L2 R+ ve α ,β ∈Colup, α + β ≠ 0. Spectrum incelendiğinde lim ( ) = 0, sup{ [ ′( ) + ( )]}< ∞, > 0 ∈ + →∞ ε ε Q x e Q x K x x x R x koşulunun sağlanması durumunda L operatörünün sonlu sayıda sonlu katlı özdeğerlere ve spektral tekilliklere sahip olduğu araştırılmıştır. Sonra spektral tekilliklere göre baş fonksiyonlar incelenmiştir. Ayrıca L operatörünün bazı sonuçları non-selfadjoint Sturm-Liouville denklemine de her zaman uygulanabilir.
Abstract (Original Language): 
In this atricle we investigated the spectrum and the spectral singularities of the Quadratic pencil of Klein-Gordon Operator L generated in L2 (R+) by the differential expression = ′′+( ) − ∈ = ( ∞) + ( ) ( ) , x 0, 2 l y y λ Q x y R and the boundary condition ∫ ∞ + ′ − = 0 K(x)y(x)dx αy (0) βy(0) 0 where Q and K are coplex valued functions ( ) K ∈L2 R+ and α ,β ∈C , with α + β ≠ 0. Discussing the spectrum, we proved that L has a finite number of eigenvalues and spectral singulatities with finite multuplicities, if the conditions lim ( ) = 0, sup{ [ ′( ) + ( )]}< ∞, > 0 ∈ + →∞ ε ε Q x e Q x K x x x R x hold. Later we have investigated the properties of the principal functions corresponding to the spectral singularities. Moreover, some results about the spectrum of L have also been applied to non-selfadjoint Sturm-Liouville.
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