NS3 - Different aspects of the QCD phase diagram investigated with hadronic models |
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Speaker |
Tolos, Laura |
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Coauthors |
Negreiros, Rodrigo; Centelles, Mario; Ramos, Angels; Dexheimer, Veronica |
| Talk Title |
The Equation of State and Cooling of Hyperonic Neutron Stars |
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Abstract |
We perform cooling simulations for isolated neutron stars using recently developed equations of state for their nucleonic and hyperonic core. The equations of state are obtained from new parametrizations of the FSU2 relativistic mean-field functional that reproduce the properties of nuclear matter and finite nuclei, while fulfilling the restrictions on high-density matter deduced from heavy-ion collisions, measurements of massive 2Msun neutron stars, and calculations of neutron star radii below 13 km. We find that two of the models studied, FSU2R (with nucleons) and in particular FSU2H (with nucleons and hyperons), show very good agreement with cooling observations, even without including extensive nucleon pairing. This suggests that the cooling observations are compatible with an equation of state that produces a soft nuclear symmetry energy and, hence, generates small neutron star radii. However, both models favor large stellar masses, above 1.8 Msun, to explain the colder isolated neutron stars that have been observed. |
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