Köln 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 6: Nuclear Astrophysics I
HK 6.4: Vortrag
Montag, 10. März 2025, 16:00–16:15, SR 0.03 Erw. Physik
Color Superconductivity in Compact Stars with RG-Consistent NJL Model — •Ishfaq Ahmad Rather1, Hosein Gholami2, Marco Hofmann2, Michael Michael Buballa2,3, and Jürgen Schaffner-Bielich1 — 1Institute of Theoretical Physics, Goethe University, Frankfurt am main — 2Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Theoriezentrum, Schlossgartenstr. 2, D-64289 Darmstadt, Germany — 3Helmholtz Forschungsakademie Hessen für FAIR (HFHF), GSI Helmholtzzentrum für Schwerionenforschung, Campus Darmstadt, D-64289 Darmstadt, Germany
We analyze the renormalization group-consistent (RG-consistent) three-flavor color-superconducting Nambu-Jona-Lasinio (NJL) model to explore possible compact star configurations, focusing primarily on quark stars. By varying the vector (ηV) and diquark (ηD) couplings, we study their effects on the equation of state (EoS), speed of sound, diquark gap, and mass-radius relations.
Our results show that stable color-flavor-locked (CFL) phases often dominate the core of maximum-mass stars, spanning several kilometers in radius. For other cases, the two-flavor color-superconducting (2SC) branch becomes unstable before the CFL transition density. For neutron-star densities, the squared speed of sound reaches up to cs2 ∼ 0.6. Hybrid stars constructed with these models suggest early hadron-quark transitions, impacting tidal deformability at 1.4 M⊙. We constrain NJL parameters using the 2.0 M⊙ mass limit and find the resulting EoS consistent with astrophysical measurements.
Keywords: Neutron Stars; Color-Superconductivity; Equation of State; Pure Quark Stars; NJL model