Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-05-21
Eur.Phys.J.A38:105-113,2008
Physics
Nuclear Physics
Nuclear Theory
14 pages, 9 figures, 2 tables, version accepted for publication in EJPA
Scientific paper
10.1140/epja/i2008-10652-0
The equation of state of beta-stable and charge neutral nucleonic matter is computed within the SU(2) parity doublet model in mean field and in the relativistic Hartree approximation. The mass of the chiral partner of the nucleon is assumed to be 1200 MeV. The transition to the chiral restored phase turns out to be a smooth crossover in all the cases considered, taking place at a baryon density of just $2\rho_0$. The mass-radius relations of compact stars are calculated to constrain the model parameters from the maximum mass limit of neutron stars. It is demonstrated that chiral symmetry starts to be restored, which in this model implies the appearance of the chiral partners of the nucleons, in the center of neutron stars. However, the analysis of the decay width of the assumed chiral partner of the nucleon poses limits on the validity of the present version of the model to describe vacuum properties.
Dexheimer Veronica
Pagliara Giuseppe
Schaffner-Bielich Jurgen
Schramm Stefan
Tolos Laura
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