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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

DYNAMICAL INSTABILITY OF WHITE DWARFS AND BREAKING OF SPHERICAL SYMMETRY UNDER THE PRESENCE OF EXTREME MAGNETIC FIELDS

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Author(s):
Coelho, J. G. [1, 2, 3, 4] ; Marinho, R. M. [4] ; Malheiro, M. [4] ; Negreiros, R. [5] ; Caceres, D. L. [1, 2, 3] ; Rueda, J. A. [1, 2, 3] ; Ruffini, R. [1, 2, 3]
Total Authors: 7
Affiliation:
[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome - Italy
[2] Univ Roma La Sapienza, ICRA, I-00185 Rome - Italy
[3] ICRANet, I-65122 Pescara - Italy
[4] ITA, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[5] Univ Fed Fluminense, Inst Fis, BR-24210346 Niteroi, RJ - Brazil
Total Affiliations: 5
Document type: Journal article
Source: ASTROPHYSICAL JOURNAL; v. 794, n. 1 OCT 10 2014.
Web of Science Citations: 22
Abstract

Massive, highly magnetized white dwarfs with fields up to 10(9) G have been observed and theoretically used for the description of a variety of astrophysical phenomena. Ultramagnetized white dwarfs with uniform interior fields up to 10(18) G have been recently purported to obey a new maximum mass limit, M-max approximate to 2.58 M-circle dot, which largely overcomes the traditional Chandrasekhar value, M-Ch approximate to 1.44 M-circle dot. Such a larger limit would make these astrophysical objects viable candidates for the explanation of the superluminous population of Type Ia supernovae. We show that several macro and micro physical aspects such as gravitational, dynamical stability, breaking of spherical symmetry, general relativity, inverse beta decay, and pycnonuclear fusion reactions are of most relevance for the self-consistent description of the structure and assessment of stability of these objects. It is shown in this work that the first family of magnetized white dwarfs indeed satisfy all the criteria of stability, while the ultramagnetized white dwarfs are very unlikely to exist in nature since they violate minimal requests of stability. Therefore, the canonical Chandrasekhar mass limit of white dwarfs still has to be applied. (AU)

FAPESP's process: 13/26258-4 - Superdense matter in the universe
Grantee:Manuel Máximo Bastos Malheiro de Oliveira
Support type: Research Projects - Thematic Grants