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Title: Biorthogonal quantum mechanics
Authors: Brody, DC
Keywords: biorthogonal basis;non-Hermitian Hamiltonian;PT symmetry
Issue Date: 2014
Citation: Journal of Physics A: Mathematical and Theoretical, 47:3, 2014
Abstract: The Hermiticity condition in quantum mechanics required for the characterization of (a) physical observables and (b) generators of unitary motions can be relaxed into a wider class of operators whose eigenvalues are real and whose eigenstates are complete. In this case, the orthogonality of eigenstates is replaced by the notion of biorthogonality that defines the relation between the Hilbert space of states and its dual space. The resulting quantum theory, which might appropriately be called 'biorthogonal quantum mechanics', is developed here in some detail in the case for which the Hilbert-space dimensionality is finite. Specifically, characterizations of probability assignment rules, observable properties, pure and mixed states, spin particles, measurements, combined systems and entanglements, perturbations, and dynamical aspects of the theory are developed. The paper concludes with a brief discussion on infinite-dimensional systems. © 2014 IOP Publishing Ltd.
ISSN: 1751-8113
Appears in Collections:Dept of Mathematics Research Papers

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