The symmetry energy γ parameter of relativistic mean-field models

Mariana Dutra, Odilon Lourenco, Or Hen, Eliezer Piasetzky, Débora P. Menezes

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The relativistic mean-field models tested in previous works against nuclear matter experimental values, critical parameters and macroscopic stellar properties are revisited and used in the evaluation of the symmetry energy γ parameter obtained in three different ways. We have checked that, independent of the choice made to calculate the γ values, a trend of linear correlation is observed between γ and the symmetry energy () and a more clear linear relationship is established between γ and the slope of the symmetry energy (L 0). These results directly contribute to the arising of other linear correlations between γ and the neutron star radii of and , in agreement with recent findings. Finally, we have found that short-range correlations induce two specific parametrizations, namely, IU-FSU and DD-MEδ, simultaneously compatible with the neutron star mass constraint of and with the overlap band for the region, to present γ in the range of .

Original languageEnglish
Article number064105
JournalChinese Physics C
Issue number6
StatePublished - May 2018


  • nuclear matter
  • relativistic mean-field models
  • symmetry energy


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