We study the quark deconfinement phase transition in cold (T = 0) neutron star matter and we calculate various structural properties of hybrid stars. For the quark phase, we use an equation of state (EOS) based on the Field Correlator Method (FCM) extended to the case of nonzero baryon density. For the confined hadronic phase we use a relativistic mean field model considering both pure nucleonic and hyperonic matter. We constrain the values of the gluon condensate G(2), which is one of the EOS parameter within the FCM, making use of the measured mass, M = 1.97 +/- 0.04M(circle dot), of the neutron star in PSR J1614-2230. Our results show that the values of G(2) extracted from the mass measurement of PSR J1614-2230 are consistent with the values of the same quantity derived, within the FCM, from recent lattice QCD calculations of the deconfinement transition temperature at zero baryon chemical potential.
Hybrid neutron stars with the field correlator method
LOGOTETA, DOMENICO;BOMBACI, IGNAZIO
2014-01-01
Abstract
We study the quark deconfinement phase transition in cold (T = 0) neutron star matter and we calculate various structural properties of hybrid stars. For the quark phase, we use an equation of state (EOS) based on the Field Correlator Method (FCM) extended to the case of nonzero baryon density. For the confined hadronic phase we use a relativistic mean field model considering both pure nucleonic and hyperonic matter. We constrain the values of the gluon condensate G(2), which is one of the EOS parameter within the FCM, making use of the measured mass, M = 1.97 +/- 0.04M(circle dot), of the neutron star in PSR J1614-2230. Our results show that the values of G(2) extracted from the mass measurement of PSR J1614-2230 are consistent with the values of the same quantity derived, within the FCM, from recent lattice QCD calculations of the deconfinement transition temperature at zero baryon chemical potential.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
