Hyperon and nuclear symmetry energy in the neutron star

Details Hyperon and nuclear symmetry energy in the neutron star Hyperon and nuclear symmetry energy in the neutron star

2011-08-30

arxiv.org/abs/1108.5843v1

Physics

Nuclear Physics

Nuclear Theory

17 pages, 5 figures, to be published in Physical Review C

Scientific paper

In this work, masses and radii of neutron stars are considered to investigate the effect of nuclear symmetry energy to the astrophysical observables. A relativistic mean field model with density-dependent meson-baryon coupling constants is employed in describing the equation of state of dense nuclear matter, and the density dependencies of the symmetry energies are quoted from the recent phenomenological formulae obtained from the heavy ion data at subnuclear saturation densities. Since hyperons can take part in the $\beta$-equilibrium of the dense matter inside neutron stars, we include hyperons in our estimation and their roles are discussed in combination with that of the nuclear symmetry energy.

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