EIGENFUNCTIONS OF 2d DIMENSIONAL CANONICAL SYSTEMS | ||||
| Electronic Journal of Mathematical Analysis and Applications | ||||
| Volume 13, Issue 2, 2025, Page 1-16 PDF (419.5 K) | ||||
| Document Type: Regular research papers | ||||
| DOI: 10.21608/ejmaa.2025.352855.1309 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
KESHAV RAJ ACHARYA  1; Andrei Ludu2
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| 1Department of Mathematics, Embry-Riddle Aeronautical University, 1 Aerospace Blvd., Daytona Beach, FL 32114, U.S.A | ||||
| 2Department of Mathematics, Embry-Riddle Aeronautical University, Daytona Beach, FL | ||||
| Abstract | ||||
| A 2d dimensional canonical systems is a system of 2d first order differential equation which can be written in the form Jy′ = zHy where J is a constant symplectic matrix, H is a positive semidefinite matrix and z is a complex number. In this article we show that the (normalized) eigenfunctions of 2d of such canonical systems with the boundary conditions (θ1, θ2)y(0) = (β1, β2)y(N) = 0 form an orthonormal basis for a Hilbert space L2(H, [0,N]) ⊖ Z, where Z is a closed subspace of L2(H, [0,N]), a Hilbert space of H-integrable functions. In addition, we also discuss the application of this theory to a chain of particles governed by a time-dependent. More specifically We discuss an example of a Hamiltonian system for a one dimensional chain of particles having time dependent effective masses and moving in explicit time-dependent mutual and external interaction potentials. We present a few numerical examples of solutions featuring the existence of the orthogonal systems of solutions, in the range of the numerical precision of the calculations Hamiltonian. | ||||
| Keywords | ||||
| Canonical systems; Eigen functions; Linear Relations | ||||
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