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Russian Universities Reports. Mathematics, 2020, Volume 25, Issue 129, Pages 25–47
DOI: https://doi.org/10.20310/2686-9667-2020-25-129-25-47
(Mi vtamu168)
 

This article is cited in 1 scientific paper (total in 1 paper)

Scientific articles

On the study of the spectral properties of differential operators with a smooth weight function

S. I. Mitrokhin

Lomonosov Moscow State University
Full-text PDF (627 kB) Citations (1)
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Abstract: In this paper we study the spectral properties of a third-order differential operator with a summable potential with a smooth weight function. The boundary conditions are separated. The method of studying differential operators with summable potential is a development of the method of studying operators with piecewise smooth coefficients. Boundary value problems of this kind arise in the study of vibrations of rods, beams and bridges composed of materials of different densities. The differential equation defining the differential operator is reduced to the solution of the Volterra integral equation by means of the method of variation of constants. The solution of the integral equation is found by the method of successive Picard approximations. Using the study of an integral equation, we obtained asymptotic formulas and estimates for the solutions of a differential equation defining a differential operator. For large values of the spectral parameter, the asymptotics of solutions of the differential equation that defines the differential operator is derived. Asymptotic estimates of solutions of a differential equation are obtained in the same way as asymptotic estimates of solutions of a differential operator with smooth coefficients. The study of boundary conditions leads to the study of the roots of the function, presented in the form of a third-order determinant. To get the roots of this function, the indicator diagram wasstudied. The roots of this equation are in three sectors of an infinitely small size, given by the indicator diagram. The article studies the behavior of the roots of this equation in each of the sectors of the indicator diagram. The asymptotics of the eigenvalues of the differential operator under study is calculated. The formulas found for the asymptotics of eigenvalues allow us to study the spectral properties of the eigenfunctions of the differential operator under study.
Keywords: spectral parameter, differential operator, boundary value problem, summable potential, boundary conditions, weight function, indicator diagram, asymptotics of the eigenvalues.
Received: 17.01.2020
Document Type: Article
UDC: 517.9
Language: Russian
Citation: S. I. Mitrokhin, “On the study of the spectral properties of differential operators with a smooth weight function”, Russian Universities Reports. Mathematics, 25:129 (2020), 25–47
Citation in format AMSBIB
\Bibitem{Mit20}
\by S.~I.~Mitrokhin
\paper On the study of the spectral properties of differential operators with a smooth weight function
\jour Russian Universities Reports. Mathematics
\yr 2020
\vol 25
\issue 129
\pages 25--47
\mathnet{http://mi.mathnet.ru/vtamu168}
\crossref{https://doi.org/10.20310/2686-9667-2020-25-129-25-47}
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  • This publication is cited in the following 1 articles:
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    Russian Universities Reports. Mathematics
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