Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Heavy-Ion Collisions and QCD Phases V

HK 30.4: Vortrag

Mittwoch, 12. März 2025, 16:45–17:00, HS 3 Chemie

Impact of Diquarks on the QCD Phase Structure and Spectral Functions — •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

At sufficiently high densities quark matter is expected to become color superconducting through the formation of diquarks. We investigate the role of diquarks in the two-flavor QCD phase structure within a functional renormalization group framework. For sufficiently strong diquark couplings, we find that the onset of diquark condensation precedes the chiral phase transition. By examining the diquark spectral functions, we find that this effect is caused by the behavior of the diquark pole mass. Additionally, we discuss the behavior of the sigma, pion, and diquark spectral functions in the presence of a finite diquark condensate.

Keywords: Functional Renormalisation Group; Color-superconductivity; Spectral Functions; QCD Phase Structure