Münster 2002 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 11: Poster Session: Nuclear and Particle Astrophysics
HK 11.2: Poster
Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie
Hyperon ordering in neutron star matter — •L. Mornas1, M.A. Perez Garcia1, J. Diaz Alonso1,2, J.P. Suarez Curieses1, and N. Corte Rodriguez1 — 1Departamento de Fisica, Universidad de Oviedo, E-33007, Oviedo, Asturias, Spain — 2Observatoire de Paris, DARC (UMR 8629 CNRS) F-92190 Meudon, France
In a simplified quantum hadrodynamics model where neutrons, protons and Λ hyperons interact via the exchange of σ and ω mesons, we compare the energy of the usually assumed uniform phase of neutron star matter, to a configuration in which di-lambda pairs immersed in an uniform nucleon fluid are localized on the nodes of a regular lattice. The confining potential is calculated self consistently under the condition of β-equilibrium. We were able to obtain stable ordered phases for some reasonable values of the model parameters. The equation of state can be considerably softened if such a transition takes place. This could in turn have important consequences on the structure and cooling of neutron stars.
[1] M.A. Pérez García, et al.,Nucl. Phys. A in press