On the magnetic field evolution time-scale in superconducting neutron star cores

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Título: On the magnetic field evolution time-scale in superconducting neutron star cores
Autor/es: Passamonti, Andrea | Akgün, Taner | Pons, José A. | Miralles, Juan A.
Grupo/s de investigación o GITE: Astrofísica Relativista
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Física Aplicada
Palabras clave: Stars: evolution | Stars: magnetars | Stars: magnetic field | Stars: neutron
Área/s de conocimiento: Astronomía y Astrofísica
Fecha de publicación: 15-may-2017
Editor: Oxford University Press
Cita bibliográfica: Monthly Notices of the Royal Astronomical Society. 2017, 469(4): 4979-4984. doi:10.1093/mnras/stx1192
Resumen: We revisit the various approximations employed to study the long-term evolution of the magnetic field in neutron star cores and discuss their limitations and possible improvements. A recent controversy on the correct form of the induction equation and the relevant evolution time-scale in superconducting neutron star cores is addressed and clarified. We show that this ambiguity in the estimation of time-scales arises as a consequence of nominally large terms that appear in the induction equation, but which are, in fact, mostly irrotational. This subtlety leads to a discrepancy by many orders of magnitude when velocity fields are absent or ignored. Even when internal velocity fields are accounted for, only the solenoidal part of the electric field contributes to the induction equation, which can be substantially smaller than the irrotational part. We also argue that stationary velocity fields must be incorporated in the slow evolution of the magnetic field as the next level of approximation.
Patrocinador/es: AP acknowledges support from the European Union under the Marie Sklodowska Curie Actions Individual Fellowship, grant agreement no 656370. This work is supported in part by the Spanish MINECO grant AYA2015-66899-C2-2-P, and by the New Compstar COST action MP1304.
URI: http://hdl.handle.net/10045/68923
ISSN: 0035-8711 (Print) | 1365-2966 (Online)
DOI: 10.1093/mnras/stx1192
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Revisión científica: si
Versión del editor: http://dx.doi.org/10.1093/mnras/stx1192
Aparece en las colecciones:INV - Astrofísica Relativista - Artículos de Revistas

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