Erlangen 2026 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Heavy-Ion Collisions and QCD Phases IV
HK 24.1: Gruppenbericht
Mittwoch, 18. März 2026, 13:45–14:15, PHIL A 401
Diquark Properties from First Principles and Their Impact on Color Superconducting Matter — Hosein Gholami1, •Ugo Mire2, Fabian Rennecke2,3, Bernd-Jochen Schaefer2,3, and Shi Yin2 — 1Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, Theoriezentrum, Darmstadt, Germany — 2Institut für Theoretische Physik, Justus-Liebig-Universität Gießen, Gießen, Germany — 3Helmholtz Forschungsakademie Hessen für FAIR (HFHF), GSI Helmholtzzentrum für Schwerionenforschung, Campus Gießen, Gießen, Germany
Recent neutron star observations demand increasingly precise equations of state at extreme densities where exotic phases of matter may appear. An intriguing candidate is color superconductivity, in which quarks pair into diquarks that condense, making a first-principles understanding of diquark dynamics essential for interpreting astrophysical data. In this talk I will present results for the vacuum properties of the scalar diquark in a self-consistent and first-principle approach to QCD. Using the functional renormalization group, I will show how the high energy quark and gluon degrees of freedom can be smoothly integrated resulting in a low-energy description in terms of mesons and diquarks. I will show that our approach predict a scalar diquark bound state, consistent with the quark-diquark picture of the nucleon. Finally, I will demonstrate how these results can constrain low-energy models of color superconductivity, yielding new insights into the equation of state of cold and dense quark matter.
Keywords: diquark; color superconductivity; functional renormalization group; quantum chromodynamics; neutron stars