Modeling Hybrid Stars with an SU(3) non-linear sigma model

Understand

We study the behavior of hybrid stars using an extended hadronic and quark SU(3) non-linear sigma model.

• The degrees of freedom change naturally, in this model, from hadrons to quarks as the density/temperature increases.
• At zero temperature, we reproduce massive neutron stars containing a core of hybrid matter of 2 km for the non-rotating case and 1.18 km and 0.87 km, in the equatorial and polar directions respectively, for stars rotating at the Kepler frequency (physical cases lie in between).
• The cooling of such stars is also analyzed.