Journals / Hacettepe Journal of Mathematics and Statistics / 2026 / Volume: 49 Issue: 5

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

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Publication Date
2020-10-06
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⚡ TL;DR(Too Long; Didn't Read)

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 $.

📌 3 Key Takeaways

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Objective & Hypothesis:In this paper, we analyze the non-selfadjoint Sturm-Liouville operator $L$ defined in the Hilbert space $L_{2}(\mathbb{R},H)$ of vector-valued functions which are strongly-measurable and square-integrable in $ \mathbb{R} $. $L$ is defined \[L(y)=-y''+Q(x)y,\, x\in\mathbb{R} \] for every $ y \in L_{2}(\mathbb{R},H) $ where the potential $Q(x)$ 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.
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Key Findings & Data:In this paper, we analyze the non-selfadjoint Sturm-Liouville operator $L$ defined in the Hilbert space $L_{2}(\mathbb{R},H)$ of vector-valued functions which are strongly-measurable and square-integrable in $ \mathbb{R} $. $L$ is defined \[L(y)=-y''+Q(x)y,\, x\in\mathbb{R} \] for every $ y \in L_{2}(\mathbb{R},H) $ where the potential $Q(x)$ 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.
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Conclusion & Impact: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 $.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Sturm-Liouville operator equation · eigenvalues · spectral singularities

Abstract

In this paper, we analyze the non-selfadjoint Sturm-Liouville operator $L$ defined in the Hilbert space $L_{2}(\mathbb{R},H)$ of vector-valued functions which are strongly-measurable and square-integrable in $ \mathbb{R} $. $L$ is defined \[L(y)=-y''+Q(x)y,\, x\in\mathbb{R} \] for every $ y \in L_{2}(\mathbb{R},H) $ where the potential $Q(x)$ 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 $.

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Cite This Article

Mutlu, G., Arpat, E. K. (2020). Spectral properties of non-selfadjoint Sturm-Liouville operator equation on the real axis. Hacettepe Journal of Mathematics and Statistics, Volume: 49 Issue: 5. https://doi.org/10.15672/hujms.577991

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References (29)

  1. Z.S. Agranovic, V.A. Marchenko, The Inverse Problem of Scattering Theory, Gordon and Breach, 1965.
  2. E.K. Arpat and G. Mutlu, Spectral properties of Sturm-Liouville system with eigenvalue-dependent boundary conditions, Internat. J. Math. 26 (10), 1550080- 1550088, 2015.
  3. E. Bairamov, E.K. Arpat and G. Mutlu, Spectral properties of non-selfadjoint Sturm- Liouville operator with operator coefficient, J. Math. Anal. Appl. 456 (1), 293-306, 2017.
  4. E. Bairamov and Ş. Cebesoy, Spectral singularities of the matrix Schrödinger equations, Hacet. J. Math. Stat. 45 (4), 1007-1014, 2016.
  5. E. Bairamov and E. Kir, Principal functions of the non-selfadjoint operator generated by system of differential equations, Math. Balkanica (N.S.) 13 (1-2), 85–98, 1999.
  6. E. Bairamov and E. Kir, Spectral properties of a finite system of Sturm-Liouville differential operators, Indian J. Pure Appl. Math. 35 (2), 249–256, 2004.
  7. E. Bairamov and G.B. Tunca, Discrete spectrum and principial functions of nonselfadjoint differential operator, Czechoslavak Math. J. 49 (124), 689-700, 1999.
  8. B.B. Blashak, On the second-order differential operator on the whole axis with spectral singularities (In Russian), Dokl. Akad. Nauk Ukr. SSR I, 38-41, 1966.
  9. R. Carlson, An inverse problem for the matrix Schrödinger equation, J. Math. Anal. Appl. 267, 564-575, 2002.
  10. S. Clark, F. Gesztesy and W. Renger, Trace formulas and Borg-type theorems for matrix-valued Jacobi and Dirac finite difference operators, J. Differ. Equations 219, 144-182, 2005.
  11. C. Coskun and M. Olgun, Principal functions of non-selfadjoint matrix Sturm- Liouville equations, J. Comput. Appl. Math. 235, 4834-4838, 2011.
  12. E.P Dolzhenko, Boundary value uniqueness theorems for analytic functions, Math. Notes 26 (6), 437-442, 1979.
  13. M.G. Gasymov, Expansion in solutions of the scattering problem for a nonselfadjoint Schrödinger equation (In Russian), Dokl. Akad. Nauk AzSSR 22 (10), 9-12, 1966.
  14. M.G. Gasymov, V.V. Zikov and B.M. Levitan, Conditions for discreteness and finiteness of the negative spectrum of Schrödinger’s operator equation (in Russian), Mat. Zametki 2, 531–538, 1967.
  15. F. Gesztesy, A. Kiselev and K.A. Makarov, Uniqueness results for matrix-valued Schrodinger, Jacobi and Dirac-type operators, Math. Nachr. 239, 103-145, 2002.
  16. M.V. Keldysh, On eigenvalues and eigenfunctions of some classes of nonselfadjoint equations (in Russian), Dokl. Akad. Nauk. SSSR 77 (1), 11-14, 1951.
  17. M.V. Keldysh, On the completeness of the eigenfunctions of some classes of nonselfadjoint linear operators, Russ. Math. Surv. 26 (4), 1544, 1971.
  18. A.N. Kolmogorov and S.V. Fomin, Introductory Real Analysis, Dover Publ., New York, 1975.
  19. A.G. Kostjucenko and B. M. Levitan, Asymptotic behavior of eigenvalues of the operator Sturm-Liouville problem (in Russian), Funkcional. Anal. i Prilozen 1, 86–96, 1967.
  20. B.M. Levitan, Investigation of the Green’s function of a Sturm-Liouville equation with an operator coefficient (in Russian), Mat. Sb. (N.S.) 76 (118), 239–270, 1968.
  21. B.M. Levitan and G. A. Suvorcenkova, Sufficient conditions for discreteness of the spectrum of a Sturm-Liouville equation with operator coefficient (in Russian), Funkcional. Anal. i Prilozen 2 (2), 56–62, 1968.
  22. V.E. Lyance, A differential operator with spectral singularities, II, Amer. Math. Soc. Transl. Ser. 2 60, 227283, 1967.
  23. B. Nagy, Operators with spectral singularities, J. Operat. Theor. 15 (2), 307-325, 1986.
  24. M.A. Naimark, Investigation of the spectrum and the expansion in eigenfunctions of a non-selfadjoint operator of second order on a semi-axis, Tr. Mosk. Mat. Obs. 3, 181270, 1954.
  25. M.A. Naimark, Linear differential operators, II, Ungar, New York, 1968.
  26. M. Olgun, Non-selfadjoint matrix Sturm-Liouville operators with eigenvaluedependent boundary conditions, Hacet. J. Math. Stat. 44 (3), 607614, 2015.
  27. M. Olgun and C. Coskun, Non-selfadjoint matrix Sturm-Liouville operators with spectral singularities, Appl. Math. Comput. 216, 2271-2275, 2010.
  28. B.S. Pavlov, The Nonself-Adjoint Schrödinger Operator, in: Birman M.S. (eds) Spectral Theory andWave Processes, Topics in Mathematical Physics, 1, 87-114, Springer, Boston, MA, 1967.
  29. K. Yosida, Functional Analysis, Springer-Verlag, Berlin-Göttingen-Heidelberg, 1980.