Representation of a complex Green function on a real basis: I. General Theory

Details Representation of a complex Green function on a real basis: I. General Theory Representation of a complex Green function on a real basis: I. General Theory

1999-09-15

arxiv.org/abs/physics/9909028v3

Physics

Atomic Physics

about 40 pages with 5 eps-figures

Scientific paper

10.1103/PhysRevA.62.062705

When the Hamiltonian of a system is represented by a finite matrix, constructed from a discrete basis, the matrix representation of the resolvent covers only one branch. We show how all branches can be specified by the phase of a complex unit of time. This permits the Hamiltonian matrix to be constructed on a real basis; the only duty of the basis is to span the dynamical region of space, without regard for the particular asymptotic boundary conditions that pertain to the problem of interest.

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