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Interplay between the symmetry energy and the strangeness content of neutron stars

Authors: Constança ProvidĂȘncia and Aziz Rabhi

Ref.: Phys. Rev. C 87, 055801-055809 (2013)

Abstract: The effect of the density dependence of the nucleonic equation of state and the hyperon-meson couplings on the star properties, including strangeness content, mass, and radius, are studied within a relativistic mean-field formalism. Information is still lacking on the nucleonic equation of state at suprasaturation densities and on the hyperon interactions in nuclear matter that will allow a clear answer to the question of whether the mass of the pulsar J1614-2230 could rule out exotic degrees of freedom from the interior of compact stars. We show that some star properties are affected in a similar way by the density dependence of the symmetry energy and the hyperon content of the star. To disentangle these two effects it is essential to have a good knowledge of the equation of state at suprasaturation densities. A linear correlation between the radius and the strangeness content of a star with a fixed mass is obtained.

DOI: 10.1103/PhysRevC.87.055801