Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Heavy-Ion Collisions and QCD Phases IV

HK 24.2: Talk

Wednesday, March 18, 2026, 14:15–14:30, PHIL A 401

Renormalization-Group Invariant Parity-Doublet Model for Nuclear and Neutron-Star Matter — •Mattia Recchi¹, Lorenz von Smekal^1,2, and Jochen Wambach³ — ¹Institut für Theoretische Physik, Justus-Liebig-Universität, Heinrich-Buff-Ring 16, 35392 Giessen, Germany — ²Helmholtz Forschungsakademie Hessen für FAIR (HFHF), GSI Helmholtzzentrum für Schwerionenforschung, Campus Giessen — ³Technische Universität Darmstadt, 64289, Darmstadt, Germany

The Parity-Doublet Model (PDM) is a chirally invariant effective theory for nuclear matter that incorporates a chirally invariant mass through opposite-parity partners. We develop a multiplicatively renormalizable mean-field approach to include baryonic vacuum contributions in the grand-canonical potential in a manifestly renormalization-group invariant form. We study the chiral dynamics and equation of state of the model, focusing on the restoration of spontaneously broken chiral symmetry at baryon densities and temperatures relevant for neutron-star astrophysics and heavy-ion collisions. We find that baryonic vacuum fluctuations have a crucial impact on the evolution of the chiral condensate and are essential for a realistic description of neutron-star structure.

Keywords: Heavy Ion Collision; Neutron Star; Nuclear Physics; QCD Phase Diagram; Chiral Symmetry