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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Heavy-Ion Collisions and QCD Phases V

HK 23.1: Group Report

Tuesday, March 12, 2024, 15:45–16:15, HBR 62: EG 18

Superconducting Quark Matter Core in Neutron Stars including Mesonic Fluctuations — •Ugo Mire¹ and Bernd-Jochen Schaefer^1,2 — ¹Institut für Theoretische Physik, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany — ²Helmholtz Forschungsakademie Hessen für FAIR (HFHF), GSI Helmholtzzentrum für Schwerionenforschung, Campus Gießen, 35392 Gießen, Germany

A nonperturbative equation of state for two-flavor superconducting quark matter is constructed by means of a functional renormalization group (FRG) method within a quark-meson-diquark truncation. The phase structure at finite temperature, charge and quark chemical potential is investigated. The effects of mesonic fluctuations including possible truncation artifacts are discussed. By considering a smooth transition between the normal and superconducting quark matter phase we obtain an electrically and color neutral as well as β-equilibrated equation of state. This enables a detailed analysis of the tidal deformabilities and mass-radius relations of hybrid stars with superconducting quark cores and hadronic shells. We find that already the mesonic fluctuations lead to significant modifications of the corresponding astrophysical observables in the mass region of M≈1.5 M_⊙. However, the inclusion of additional interaction channels is mandatory in the present FRG truncation since the two-solar mass limit cannot be reached.

Keywords: QCD Phase Structure; Neutron Stars; Color Superconductivity; Functional Renormalization Group