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Completeness and orthonormality in PT-symmetric quantum systems

Weigert, S. (orcid.org/0000-0002-6647-3252) (2003) Completeness and orthonormality in PT-symmetric quantum systems. Physical Review A. art no. 062111. ISSN 1094-1622

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Some PT-symmetric non-Hermitian Hamiltonians have only real eigenvalues. There is numerical evidence that the associated PT-invariant energy eigenstates satisfy an unconventional completeness relation. An ad hoc scalar product among the states is positive definite only if a recently introduced "charge operator" is included in its definition. A simple derivation of the conjectured completeness and orthonormality relations is given. It exploits the fact that PT symmetry provides a link between the eigenstates of the Hamiltonian and those of its adjoint, forming a dual pair of bases. The charge operator emerges naturally upon expressing the properties of the dual bases in terms of one basis only, and it is shown to be a function of the Hamiltonian.

Item Type: Article
Copyright, Publisher and Additional Information: © 2003 The American Physical Society. Reproduced in accordance with the publisher's self-archiving policy.
Institution: The University of York
Academic Units: The University of York > Mathematics (York)
Depositing User: Repository Officer
Date Deposited: 23 Jun 2006
Last Modified: 25 Apr 2016 12:58
Published Version: http://dx.doi.org/10.1103/PhysRevA.68.062111
Status: Published
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/1372

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