Hyperon stars in the Brueckner-Bethe-Goldstone theory
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- 13 April 2000
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review C
- Vol. 61 (5), 055801
- https://doi.org/10.1103/PhysRevC.61.055801
Abstract
In the framework of the Brueckner-Bethe-Goldstone theory, we determine a fully microscopic equation of state for asymmetric and -stable nuclear matter containing and hyperons. We use the Paris and the new Argonne 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 (1.22) when the Paris 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%.
Keywords
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