EXACT SOLUTIONS TO THE BOUNDARY-VALUE PROBLEMS FOR THE HELMHOLTZ EQUATION IN A LAYER WITH POLYNOMIALS IN THE RIGHT-HAND SIDES OF THE EQUATION AND OF THE BOUNDARY CONDITIONS

• Main Author: Алгазин Олег Дмитриевич
• Format: Article
• Language: Russian
• Published: Moscow Region State University Editorial Office 2020-04-01
• Series: Вестник московского государственного областного университета. Серия: Физика-математика
• Subjects: Helmholtz equation; Dirichlet problem; Dirichlet-Neumann problem; Fourier transform; generalized functions of slow growth
• Online Access: http://vestnik-mgou.ru/Articles/View/13641

Purpose. We have found exact solutions to boundary-value problems for the inhomogeneous Helmholtz equation with the polynomial right-hand side in a multidimensional infinite layer bounded by two hyperplanes. Methodology and Approach. The paper considers Dirichlet and Dirichlet-Neumann boundary-value problems with polynomials in the right-hand sides of the boundary conditions. The Fourier transform of generalized functions of slow growth is applied. Results. It is shown that the Dirichlet and Dirichlet-Neumann boundary-value problems with polynomials in the right-hand sides of the boundary conditions for the inhomogeneous Helmholtz equation with the polynomial right-hand side have a solution that is a quasi-polynomial containing, in addition to power functions, hyperbolic or trigonometric functions. This solution is unique in the class of functions of slow growth if the parameter of the equation is not an eigenvalue. An algorithm for constructing this solution is presented and examples are considered. Theoretical and Practical Implications. Exact solutions to boundary-value problems for one of the well-known equations of mathematical physics have been obtained.