Geodesic
`Far interaction' of small spectral perturbations of the Neumann boundary conditions for an elliptic system of differential equations in a~three-dimensional domain
Sbornik. Mathematics, Tome 214 (2023) no. 1, pp. 58-107

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A formally selfadjoint system of second-order differential equations is considered in a three-dimensional domain on small parts of whose boundary an analogue of Steklov spectral conditions is set, while the Neumann boundary conditions are set on the rest of the boundary. Under certain algebraic and geometric conditions an asymptotic expression for the eigenvalues of this problem is presented and a limiting problem is put together, which produces the leading asymptotic terms and involves systems of integro-differential equations in half-spaces, interconnected by means of certain integral characteristics of vector-valued eigenfunctions. One example of a concrete problem in mathematical physics describes surface waves in several ice holes made in the ice cover of a water basin, and the asymptotic formula for eigenfrequencies shows that the local wave processes interact independently of the distance between the holes. Another series of applied problems relates to elastic fixings of bodies along small pieces of their surfaces. Possible generalizations are discussed; a number of related open questions are stated. Bibliography: 41 titles.
Keywords: second-order elliptic system of equations, Neumann and Steklov boundary conditions, asymptotic behaviour of eigenvalues, far interaction.
Mots-clés : singular perturbations 
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     author = {S. A. Nazarov},
     title = {`Far interaction' of small spectral perturbations of the {Neumann} boundary conditions for an elliptic system of differential equations in a~three-dimensional domain},
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S. A. Nazarov. `Far interaction' of small spectral perturbations of the Neumann boundary conditions for an elliptic system of differential equations in a~three-dimensional domain. Sbornik. Mathematics, Tome 214 (2023) no. 1, pp. 58-107. http://geodesic.mathdoc.fr/item/SM_2023_214_1_a3/