Neutron star properties with unified equations of state of dense matter

Aims. In this paper, we study the global properties of neutron stars (NSs), as predicted by the Brussels-Montreal equations of state (EoSs). These EoSs, which provide a unified description of all regions of a NS, are based on the generalised Skyrme functionals BSk19, BSk20, and BSk21 that were simul...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2013-11, Vol.559, p.1-10
Main Authors: Fantina, A. F., Chamel, N., Pearson, J. M., Goriely, S.
Format: Article
Language:English
Subjects:
Astronomy
Compatibility
dense matter
equation of state
Equations of state
gravitation
Mathematical analysis
methods: numerical
Neutron stars
Nuclear matter
Relativity
Rotating
stars: neutron
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Summary:Aims. In this paper, we study the global properties of neutron stars (NSs), as predicted by the Brussels-Montreal equations of state (EoSs). These EoSs, which provide a unified description of all regions of a NS, are based on the generalised Skyrme functionals BSk19, BSk20, and BSk21 that were simultaneously fitted to almost all the nuclear mass data and constrained to reproduce various properties of infinite nuclear matter, as obtained from microscopic calculations. Methods. We solved Einstein’s equations of general relativity for both non-rotating and rigidly rotating NSs using these unified EoSs. Results. The NS properties thus obtained are compared with various astrophysical observations. We find that only the stiffest EoS, based on the functional BSk21, is compatible with all the constraints inferred from these observations.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201321884