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Weyl–Titchmarsh matrix functions for matrix Dirac-type equations (non-self-adjoint case)

L Sakhnovich

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We consider the non-self-adjoint matrix equation of Dirac type on the line. For this case we introduce and investigate the Weyl–Titchmarsh matrix functions. We then obtain the Weyl–Titchmarsh matrix functions of Dirac-type equations with a shifted argument. Furthermore, we construct a class of the Weyl–Titchmarsh matrix functions generating potentials of the finite-band type. Using the above-mentioned results we deduce the matrix analogue of the trace formula. We consider separately the scalar case of Dirac-type equations.


PACS

02.10.Yn Matrix theory

02.30.Hq Ordinary differential equations

02.30.Zz Inverse problems

03.65.Pm Relativistic wave equations

MSC

15A15 Determinants, permanents, other special matrix functions (See also 19B10, 19B14)

34A55 Inverse problems

81Q05 Closed and approximate solutions to the Schrödinger, Dirac, Klein-Gordon and other quantum-mechanical equations

Subjects

Mathematical physics

Quantum information and quantum mechanics

Dates

Issue 6 (December 2002)

Received 14 February 2002, in final form 26 September 2002

Published 18 October 2002



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