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84.490  Articles
1 of 8.449 pages  |  10  records  |  more records»
The two dimensional set of canonical relations giving rise to minimal uncertainties previously constructed from a q-deformed oscillator algebra is further investigated. We provide a representation for this algebra in terms of a flat noncommutative space a... see more

In this paper we review an approach to the dynamics of open quantum systems based of non-Hermitian Hamiltonians. Non-Hermitian Hamiltonians arise naturally when one wish to study a subsystem interacting with a continuum of states. Moreover, quantum subsys... see more

We provide a new perspective on non-Hermitian evolution in quantum mechanics by emphasizing the same method as in the Hermitian quantum evolution. We first give a precise description of the non unitary transformation  and the associated evolution, an... see more

We discuss the construction of real matrix representations of PT-symmetric operators. We show the limitation of a general recipe presented some time ago for non-Hermitian Hamiltonians with antiunitary symmetry and propose a way to overcome it. Our results... see more

A few recent innovations of the applicability of standard textbook Quantum Theory are reviewed. The three-Hilbert-space formulation of the theory (known from the interacting boson models in nuclear physics) is discussed in its slightly broadened four-Hilb... see more

We consider the description of open quantum systems with probability sinks (or sources) in terms of general non-Hermitian Hamiltonians. Within such a framework, we study novel possible definitions of the quantum linear entropy as an indicator of the flow ... see more

The aim of this work is to develop and apply a mathematical apparatus based on nonlinear operators for solving problems of geometric optics, namely the construction of images of objects in systems of thin lenses. The problem of constructing the image of a... see more

Let X be a real in?nite-dimensional Banach space and ? a measure of noncompactness on X. Let ? be a bounded open subset of X and A : ? ? X a ?-condensing operator, which has no ?xed points on ??.Then the ?xed point index, ind(A,?), of A on ? is de?ned (se... see more

Objective: This study seeks to investigate the relationship between economic-financial indicators and non-financial indicators of Health Plan Operators (HPO) for the Health Qualification Program (HQP) of the National Health Agency (NHA) We analyzed t... see more

1 of 8.449 pages  |  10  records  |  more records»