Hybrid neutron stars with the field correlator method

14th Conference on Theoretical Nuclear Physics in Italy

Logoteta, Domenico^1 ; Bombaci, Ignazio^2

Centro de Física Computacional, Department of Physics, University of Coimbra, 3004-516 Coimbra, Portugal^1

Dipartimento di Fisica enrico Fermi, Università di Pisa, INFN Sezione di Pisa, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy^2

关键词: Baryon chemical potential;    Baryon density;    Deconfinement;    Equation of state;    Lattice QCD calculations;    Mass measurements;    Neutron stars;    Relativistic mean fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/527/1/012021/pdf
DOI  :  10.1088/1742-6596/527/1/012021

来源: IOP

【 摘 要 】

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 G2, which is one of the EOS parameter within the FCM, making use of the measured mass, M 1.97 ± 0.04 Mo, of the neutron star in PSR J1614-2230. Our results show that the values of G2extracted 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.