Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-02-24
Acta Phys.Polon. B29 (1998) 809-822
Astronomy and Astrophysics
Astrophysics
16 pages, plain TeX, 6 figs., Acta Physica Polonica B in press
Scientific paper
We study the equation of state of beta-stable dense matter and models of neutron stars in the relativistic mean field theory with the isovector scalar mean field corresponding to the delta-meson [a_0(980)]. A range of values of the delta-meson coupling compatible with the Bonn potentials is explored. Parameters of the model in the isovector sector are constrained to fit the nuclear symmetry energy, E_s=30 MeV. We find that the quantity most sensitive to the delta-meson coupling is the proton fraction of neutron star matter. It increases significantly in the presence of the delta-field. The energy per baryon also increases but the effect is smaller. The equation of state becomes slightly stiffer and the maximum neutron star mass increases for stronger delta-meson coupling.
Kubis Sebastian
Kutschera Marek
Stachniewicz Slawomir
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