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On the appearance of hyperons in neutron stars

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arxiv 0811.2939 v3 pith:JH4KLCPI submitted 2008-11-18 nucl-th astro-phhep-phhep-th

On the appearance of hyperons in neutron stars

classification nucl-th astro-phhep-phhep-th
keywords neutronstarshyperon-nucleonhyperonspotentialmatteralwaysappear
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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By employing a recently constructed hyperon-nucleon potential the equation of state of \beta-equilibrated and charge neutral nucleonic matter is calculated. The hyperon-nucleon potential is a low-momentum potential which is obtained within a renormalization group framework. Based on the Hartree-Fock approximation at zero temperature the densities at which hyperons appear in neutron stars are estimated. For several different bare hyperon-nucleon potentials and a wide range of nuclear matter parameters it is found that hyperons in neutron stars are always present. These findings have profound consequences for the mass and radius of neutron stars.

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  1. Hybrid stars with hyperons: structure based on QCD sum rule coupling constants

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    Hybrid star EOS constructed from QCDSR couplings in RMF hadronic model and bag/NJL quark models with Gibbs/Maxwell transitions yields mass-radius and tidal deformability predictions.