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• W3100879014 abstract "A long time ago, it has been conjectured that a Hamiltonian with a potential of the form x^2+i v x^3, v real, has a real spectrum. This conjecture has been generalized to a class of so-called PT symmetric Hamiltonians and some proofs have been given. Here, we show by numerical investigation that the divergent perturbation series can be summed efficiently by an order-dependent mapping (ODM) in the whole complex plane of the coupling parameter v^2, and that some information about the location of level crossing singularities can be obtained in this way. Furthermore, we discuss to which accuracy the strong-coupling limit can be obtained from the initially weak-coupling perturbative expansion, by the ODM summation method. The basic idea of the ODM summation method is the notion of order-dependent local disk of convergence and analytic continuation by an order-dependent mapping of the domain of analyticity augmented by the local disk of convergence onto a circle. In the limit of vanishing local radius of convergence, which is the limit of high transformation order, convergence is demonstrated both by numerical evidence as well as by analytic estimates." @default.
• W3100879014 created "2020-11-23" @default.
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• W3100879014 date "2010-07-01" @default.
• W3100879014 modified "2023-10-17" @default.
• W3100879014 title "Order-dependent mappings: Strong-coupling behavior from weak-coupling expansions in non-Hermitian theories" @default.
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• W3100879014 doi "https://doi.org/10.1063/1.3451104" @default.
• W3100879014 hasPublicationYear "2010" @default.
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