Nonperturbative quark matter equations of state with vector interactions - Archive ouverte HAL
Article Dans Une Revue Eur.Phys.J.ST Année : 2020

Nonperturbative quark matter equations of state with vector interactions

Konstantin Otto
  • Fonction : Auteur
Micaela Oertel
Bernd-Jochen Schaefer
  • Fonction : Auteur

Résumé

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 ω- and ϕ-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 β-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. We observe a significant impact of the vector mesons on the quark matter EoS such that the resulting EoS is sufficiently stiff to support two-solar-mass neutron stars.

Dates et versions

hal-02911930 , version 1 (04-08-2020)

Identifiants

Citer

Konstantin Otto, Micaela Oertel, Bernd-Jochen Schaefer. Nonperturbative quark matter equations of state with vector interactions. Eur.Phys.J.ST, 2020, 229 (22-23), pp.3629-3649. ⟨10.1140/epjst/e2020-000155-y⟩. ⟨hal-02911930⟩
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