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| Paper: |
A 2 M☉ Pulsar and Equation of State of Neutron-Star Cores |
| Volume: |
466, Electromagnetic Radiation from Pulsars and Magnetars |
| Page: |
151 |
| Authors: |
Haensel, P.; Zdunik, J. L. |
| Abstract: |
Recent discovery of a 2 M☉ pulsar puts interesting constraints on the equation
of state (EOS) of neutron-star cores: it has to be stiff enough to yield maximum
allowable mass of neutron stars Mmax > 2 M☉. The problem of a too low
Mmax for neutron-star models based on recent realistic baryon interaction,
due to a strong hyperon softening of the EOS at ρ > 5 × 1014 g cm-3, is
discussed. Mmax > 2 M☉ points to an additional strong repulsion between
hyperons at ρ > 5 × 1014 g cm-3, and models of such repulsive interaction
have been recently proposed. Another possibility allowing for Mmax > 2 M☉
is the presence of a sufficiently stiff quark matter, with quark phase starting
already at 5 × 1014 g cm-3. A continuum of quark-matter EOS-models is
proposed, and constraints on the EOS-model-parameters resulting from Mmax > 2 M☉ are discussed. We also consider the problem of thermodynamic
stability of quark-matter cores, and its impact on Mmax. |
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