Thursday, December 27, 2012

1212.5911 (Constança Providência et al.)

How much does the symmetry energy affect the strangeness content of a
neutron star?
   [PDF]

Constança Providência, Aziz Rabhi
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. It is shown that it is still lacking enough information on the nucleonic equation of state at supra-saturation densities and on the hyperon interactions in nuclear matter that may allow a clear answer to the question 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 supra-saturation densities.
View original: http://arxiv.org/abs/1212.5911

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