Hadron-quark phase transition in neutron stars

Exotic phases may exist in neutron stars with increasing densities. We study the hadron-quark mixed phase, which may occur in the interior of neutron stars. The relativistic mean-field model is employed to describe the hadronic phase, while the Nambu-Jona-Lasinio model with vector interactions is used for the quark phase. We study thefinite-size effects, like the surface and Coulomb energies, on the hadron-quark mixedphase in neutron stars. We show that a massive star may contain a mixed phase core and its size depends on the surface tension of the hadron-quark interface and the vector coupling between quarks. The isovector-vector meson (ρ) plays an important role to control the symmetry energy. The symmetry energy in nuclear matter has been studied intensively and is known to affect the neutron star properties such as radii, it should be important in the hadron-quark coexistence. As a result, the hadron-quark mixed phase shrinks with isovector-vector coupling in quark matter.

Dr. Xuhao Wu
DoA, Rm 2907
Mon, 2019-07-01 12:00 to 13:00