Quark Matter in the NJL Model with a Vector Interaction and the Structure of Hybrid Stars

The properties of hadron-quark hybrid stars are studied when the quark phase is described in terms a local SU(3) Nambu-Jona-Lasinio (NJL) model taking into account contribution vector and axial-vector interaction between quarks, hadronic phase, relativistic mean field (RMF) model. For different values coupling constant GV, equations state matter calculated parameters transition determined under assumption that takes place accordance with Maxwell’s construction. It shown for larger constant, equation will be “stiffer” coexistence pressure P0 phases greater. Using resulting state, TOV integrated numerically mass radius compact star central Pc. GV larger, maximum thereby, configuration smaller. Questions stability also discussed. examined here, all an infinitely small core stable. These results compared recent measurements pulsars PSR J0030+0451 J0740+6620, carried out at International Space Station NICER X-ray telescope. A comparison theoretical observational data does not exclude possibility deconfinement interiors stars.