Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Heavy Ion Collisions and QCD Phases VII

HK 30.2: Talk

Wednesday, March 29, 2017, 17:15–17:30, F 3

Lattice simulations of Two-Colour QCD at finite density — •Lukas Holicki, Jonas Wilhelm, Dominik Smith, and Lorenz von Smekal — Institut fuer Theoretische Physik, Justus Liebig Universitaet Giessen, 35392 Giessen, Germany

Lattice Monte Carlo simulations of QCD-like gauge theories can be performed at finite density without sign problem and by now have a long history already. Such simulations allow a direct comparison to effective theories. The physics of the bosonic diquark baryons in two-colour QCD is believed to be fairly well understood and qualitatively resembles QCD at finite isospin density with pion condensation. There is good guidance from effective field theory predictions and model studies of the BEC-BCS crossover inside the condensed phase. Lattice studies suffer from discretization artifacts when the lattice is too coarse. We therefore use an improved gauge action and lattice couplings that are somewhat larger than those of the early studies. This implies that we have to worry about additive renormalization in the chiral condensate before we can compare our results with the effective field theory predictions. We also confirm that the Polyakov-loop does not respond to the finite density in the staggered formulation. However, we find evidence that the flavour symmetry breaking pattern restores to its continuum form, which is reflected in the pseudo-Goldstone spectrum at high densities.