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dc.date.accessioned 2021-09-30T18:54:26Z
dc.date.available 2021-09-30T18:54:26Z
dc.date.issued 2005-09-02
dc.identifier.uri http://sedici.unlp.edu.ar/handle/10915/125991
dc.description.abstract We discuss the necessity of using nonstandard boson operators for diagonalizing quadratic bosonic forms which are not positive definite and its convenience for describing the temporal evolution of the system. Such operators correspond to non-Hermitian coordinates and momenta and are associated with complex frequencies. As application, we examine a bosonic version of a BCS-like pairing Hamiltonian, which, in contrast with the fermionic case, is stable just for limited values of the gap parameter and requires the use of the present extended treatment for a general diagonal representation. The dynamical stability of such forms and the occurrence of nondiagonalizable cases are also discussed. en
dc.language en es
dc.subject Bcs theory es
dc.subject Physics es
dc.subject Quadratic equation es
dc.subject Diagonal es
dc.subject Pairing es
dc.subject Hamiltonian (quantum mechanics) es
dc.subject Mathematical physics es
dc.subject Positive-definite matrix es
dc.subject Fermion es
dc.subject Quantum mechanics es
dc.subject Boson es
dc.title Complex modes in unstable quadratic bosonic forms en
dc.type Articulo es
sedici.identifier.other arXiv:1404.4603 es
sedici.identifier.other doi:10.1103/physreva.72.032101 es
sedici.identifier.issn 1050-2947 es
sedici.identifier.issn 1094-1622 es
sedici.creator.person Rossignoli, Raúl Dante es
sedici.creator.person Kowalski, Andrés Mauricio es
sedici.subject.materias Física es
sedici.description.fulltext true es
mods.originInfo.place Facultad de Ciencias Exactas es
sedici.subtype Articulo es
sedici.rights.license Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
sedici.rights.uri http://creativecommons.org/licenses/by-nc-sa/4.0/
sedici.description.peerReview peer-review es
sedici.relation.journalTitle Physical Review A es
sedici.relation.journalVolumeAndIssue vol. 72, no. 3 es


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Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Excepto donde se diga explícitamente, este item se publica bajo la siguiente licencia Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)