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We study the hadron-quark phase transition in neutron star matter and thestructural properties of hybrid stars using an equation of state (EOS) for thequark phase derived with the field correlator method (FCM). We make use of themeasured neutron star masses, and particularly the mass of PSR J1614-2230, toconstrain the values of the gluon condensate $G_2$ which is one of the EOSparameter within the FCM. We find that the values of $G_2$ extracted from themass measurement of PSR J1614-2230 are fully consistent with the values of thesame quantity derived, within the FCM, from recent lattice quantumchromodynamics (QCD) calculations of the deconfinement transition temperatureat zero baryon chemical potential. The FCM thus provides a powerful tool tolink numerical calculations of QCD on a space-time lattice with neutron starsphysics.

A link between measured neutron star masses and lattice QCD data