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Hyperon stars in the Brueckner-Bethe-Goldstone theory | | M.Baldo
; G.F.Burgio
; H.-J. Schulze
; | | Date: |
28 Dec 1999 | | Journal: | Phys.Rev. C61 (2000) 055801 | | Subject: | nucl-th astro-ph | | Affiliation: | INFN Sezione di Catania, Italy), G.F.Burgio (INFN Sezione di Catania, Italy) and H.-J. Schulze (Universitat de Barcelona, Spain | | Abstract: | In the framework of the Brueckner-Bethe-Goldstone theory, we determine a fully microscopic equation of state for asymmetric and $eta$-stable nuclear matter containing $sim$ and $la$ hyperons. We use the Paris and the new Argonne $Av_{18}$ two-body nucleon interaction, whereas the nucleon-hyperon interaction is described by the Njimegen soft-core model. We stress the role played by the three-body nucleon interaction, which produces a strong repulsion at high densities. This enhances enormously the hyperon population, and produces a strong softening of the equation of state, which turns out almost independent on the nucleon-nucleon interaction. We use the new equation of state in order to calculate the structure of static neutron stars. We obtain a maximum mass configuration with $M_{
m max}$ = 1.26 (1.22) when the Paris ($Av_{18}$) nucleon potential is adopted. Central densities are about 10 times normal nuclear matter density. Stellar rotations, treated within a perturbative approach, increase the value of the limiting mass by about 12%. | | Source: | arXiv, nucl-th/9912066 | | Services: | Forum | Review | PDF | Favorites | |
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