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Level Density in the Complex Scaling Method

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arxiv nucl-th/0502012 v3 pith:O27NOQ2N submitted 2005-02-03 nucl-th

Level Density in the Complex Scaling Method

classification nucl-th
keywords continuumcalculatedcomplexmethodstatesbasisdensitydiscretized
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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It is shown that the continuum level density (CLD) at unbound energies can be calculated with the complex scaling method (CSM), in which the energy spectra of bound states, resonances and continuum states are obtained in terms of $L^2$ basis functions. In this method, the extended completeness relation is applied to the calculation of the Green functions, and the continuum-state part is approximately expressed in terms of discretized complex scaled continuum solutions. The obtained result is compared with the CLD calculated exactly from the scattering phase shift. The discretization in the CSM is shown to give a very good description of continuum states. We discuss how the scattering phase shifts can inversely be calculated from the discretized CLD using a basis function technique in the CSM.

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Cited by 4 Pith papers

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  1. Quasinormal modes and continuum response of de Sitter black holes via complex scaling method

    hep-th 2026-05 unverdicted novelty 6.0

    Complex scaling turns the outgoing boundary problem for de Sitter black hole perturbations into a spectral problem, enabling unified computation of quasinormal modes and continuum response for scalar, electromagnetic,...

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    hep-ph 2026-03 conditional novelty 6.0

    Using one-boson-exchange potentials and superflavor symmetry, the authors predict many hadronic molecules of charmed mesons and doubly charmed baryons as partners of the Tcc tetraquark.

  3. Quasinormal modes and continuum response of de Sitter black holes via complex scaling method

    hep-th 2026-05 unverdicted novelty 5.0

    Complex scaling unifies quasinormal modes and continuum response for black-hole perturbations in four-dimensional Schwarzschild-de Sitter spacetimes.

  4. Complex scaling approach to quasinormal modes of Schwarzschild and Reissner--Nordstr\"om black holes

    hep-th 2026-04 unverdicted novelty 5.0

    Complex scaling converts outgoing boundary conditions into eigenvalue problems to compute quasinormal frequencies for Schwarzschild and Reissner-Nordström black holes, including the extremal limit.