Abstract
We study the constraints imposed by nuclear mass measurements and neutron-star observations on the symmetry energy. For this purpose, we use a family of unified equations of state of neutron-star interiors, based on generalised Skyrme functionals that were fitted to essentially all the experimental nuclear mass data while ensuring a realistic neutron-matter equation of state.
Highlights
Born from gravitational core-collapse supernova, neutron stars (NSs) are among the most compact objects in the Universe, with a central density which can reach several times nuclear matter density n0 0.16 fm−3
A family of three different unified equation of state (EoS), referred to as BSk19, BSk20, and BSk21 respectively, and reflecting the current lack of knowledge of high-density matter, has been recently developed [2, 3, 4, 5]. These EoSs are based on the nuclear energy density functional (EDF) theory derived from generalised Skyrme effective interactions [2, 6], supplemented with a microscopic contact pairing interaction [7]
Using these EoSs, we studied the global properties of NSs
Summary
Born from gravitational core-collapse supernova, neutron stars (NSs) are among the most compact objects in the Universe, with a central density which can reach several times nuclear matter density n0 0.16 fm−3 (see, e.g., Ref. [1]). A family of three different unified EoSs, referred to as BSk19, BSk20, and BSk21 respectively, and reflecting the current lack of knowledge of high-density matter, has been recently developed [2, 3, 4, 5] These EoSs are based on the nuclear energy density functional (EDF) theory derived from generalised Skyrme effective interactions [2, 6], supplemented with a microscopic contact pairing interaction [7]. These EDFs, employed in the Hartree-Fock-Bogoliubov (HFB) framework with phenomenological collective corrections, fit the 2149 measured masses of nuclei from the 2003 Atomic Mass Evaluation [8] with a root-mean square deviation as low as 0.58 MeV for all three models. The EoS of the core can be readily obtained from the EDF [2]
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