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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Nuclear Astrophysics II

HK 19.7: Vortrag

Dienstag, 21. März 2023, 18:45–19:00, SCH/A419

Hybrid equation of state and mass radius relation — •Hosein Gholami, Marco Hofmann, and Michael Buballa — Institut für Kernphysik,Technische Universität Darmstadt, Schlossgartenstraße 2, 64289 Darmstadt

With the discovery of gravitational waves from neutron star mergers, investigating the structure of these objects using theoretical models has gained more importance. Matter at the highest densities reached in neutron star remnants is expected to be in a color superconducting state. To constrain the quark matter equation of state at these densities, we compare with constraints on hybrid star equations of state for isolated neutron stars at zero temperature. Here we explore the speed of sound and mass-radius relation for such hybrid equations of state. We also study these properties within a renormalization group consistent approach. Our calculation is based on a mean field approximation of three flavor Nambu Jona-Lasinio (NJL)-type models. A repulsive vector interaction is included to satisfy the 2 solar mass neutron star observations. Color superconducting phases are included through the attractive scalar diquark channel.