Erlangen 2026 – wissenschaftliches Programm

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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie

GR 7: Relativistic Astrophysics II

GR 7.3: Vortrag

Mittwoch, 18. März 2026, 11:45–12:00, KH 01.016

QCD in the cores of Neutron Stars — •Oleg Komoltsev — Institut für Theoretische Physik, Goethe Universität, Frankfurt am Main

Rapid advancements in neutron-star (NS) observations allow unprecedented empirical access to cold, ultra-dense Quantum Chromodynamics (QCD) matter. The combination of these observations with theoretical calculations reveals previously inaccessible features of the equation of state and the phase diagram of QCD. In this talk, I demonstrate how perturbative-QCD calculations at asymptotically high baryon density provide robust constraints on the equation of state at neutron-star densities, based solely on causality and stability. By comparing the calculations to multimessenger neutron-star observations using a Bayesian framework, I show that QCD input softens the equation of state at neutron-star densities, supporting the hypothesis of a first-order phase transition or a crossover to quark matter cores in the most massive neutron stars.

Keywords: Equation of state of Neutron Stars; Neutron Stars phenomology; QCD phase diagram; Perturbative QCD; First-order phase transition