Nonperturbative quark matter equations of state with vector interactions

Understand

Nonperturbative equations of state (EoSs) for two and three quark flavors are constructed with the functional renormalization group (FRG) within a quark-meson model truncation augmented by vector mesons for low temperature and high density.

• Based on previous FRG studies without repulsive vector meson interactions the influence of isoscalar vector $\omega$- and $\phi$-mesons on the dynamical fluctuations of quarks and (pseudo)scalar mesons is investigated.
• The grand potential as well as vector meson condensates are evaluated as a function of quark chemical potential and the quark matter EoS in $\beta$-equilibrium is applied to neutron star (NS) physics.
• The tidal deformability and mass-radius relations for hybrid stars from combined hadronic and quark matter EoSs are compared for different vector couplings.