Repulsive properties of hadrons in lattice QCD data and neutron stars

Second-order susceptibilities ${\ensuremath{\chi}}_{ij}^{11}$ of baryon, electric, and strangeness, $B$, $Q$, $S$, charges are calculated in the chiral mean field (CMF) model compared with available lattice QCD data. The sensitive to short-range repulsive interactions between different hadron species, especially hardcore repulsion hyperons. Decreasing hyperons size, as size nonstrange baryons, does improve significantly agreement CMF results electric-charge-dependent volume mesons. comparison data suggests that strange mesons, mesons have smaller excluded volumes than baryons. these modified allows for a mainly hadronic description above pseudocritical temperature. This improved model, which is based on data, has been used study properties both cold matter neutron-star matter. phase structure cases essentially unchanged, i.e., first-order transition occurs at low temperatures $({T}_{\mathrm{CP}}\ensuremath{\approx}17\phantom{\rule{4pt}{0ex}}\mathrm{MeV})$, survive deconfinement higher densities hadrons. maximal mass remains close $2.1{M}_{\ensuremath{\bigodot}}$ mass-radius diagram only slightly due appearance astrophysical observations.