Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 16: Heavy-Ion Collisions and QCD Phases III

HK 16.6: Talk

Tuesday, March 11, 2025, 15:15–15:30, HS 3 Chemie

QCD Anderson transition with overlap valence quarks on a twisted-mass sea — •Robin Kehr¹ and Lorenz von Smekal^1,2 — 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

We investigate the QCD Anderson transition by studying the low-lying eigenmodes of the overlap operator in the background of gauge configurations with 2+1+1 quark flavors of twisted-mass Wilson fermions. The mobility edge, below which eigenmodes are localized, is estimated by the inflection point of the relative volume. The analysis of its temperature dependence suggests a close relation of localization to chiral symmetry restoration. We will present and discuss recent data on lower temperatures and with prior smoothing of the configurations with gradient flow as well as alternative definitions of localization and estimates of the mobility edge.

Based on: 10.1103/PhysRevD.109.074512, 10.48550/arXiv.2304.13617

Keywords: QCD Anderson transition; Localization; Lattice QCD; Finite temperature; Chiral fermions