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Description
In this work we present hybrid stars with a superconducting quark matter core covered by a hyperonic nuclear matter. The deconfined phase is modelled within a chirally symmetric density functional approach and follows a first order phase transition via a Maxwell construction from a hyperonic DD2 equation of state. While the hadronic phase is fixed, the range of properties of the quark matter phase as well as the position of quark onset is the result of the variation of three physical parameters of the microscopic quark Lagrangian, the vector and diquark couplings as well as the non-perturbative gluon mass. The latter represents the scale at which quark interactions cease and quark matter becomes asymptotically conformal. An earlier proposed fit formula for the quark equation is generalized to the case of arbitrary nonperturbative gluon mass and is used to produce a large set of hybrid equations of state applied for Bayesian analysis of the observational data on neutron stars supplemented by the experimental data on the vector meson mass. The analysis allows us not only to obtain the most probable values of the quark Lagrangian, but also suggest a constraint on the nonperturbative gluon mass.
