Finite-density gauge correlation functions in QC2D

Abstract

2-color QCD is the simplest QCD-like theory which is accessible to lattice simulations at finite density. It therefore plays an important role to test qualitative features and to provide benchmarks to other methods and models, which do not suffer from a sign problem. To this end, we determine the minimal-Landau-gauge propagators and 3-point vertices in this theory over a wide range of densities, the vacuum, and at both finite temperature and density. The results show that there is essentially no modification of the gauge sector in the low-temperature, low-density phase. Even outside this phase only mild modifications appear, mostly in the chromoelectric sector.

Gluon Propagators in QC2D at High Baryon Density

“…Thus results presented in Ref. [24] differ from our results presented in this paper in many respects. The reason for these rather drastic differences might be that the lattice action and lattice spacing differ from those used in our study.…”

“…Our results on the dependence of Linde screening masses on µ q are in sharp disagreement with the results of Ref. [24]. It was found in Ref.…”

“…The main conclusion of Ref. [24] was that the gluon propagators practically do not change for the range of µ q values studied: µ q < 1.1 GeV. Our main conclusion is opposite.…”

“…The gluon propagators in lattice QC 2 D were recently studied for the first time in Ref. [24]. The main conclusion of Ref.…”

“…Supported by agreement with high precision lattice results obtained in SU(2) QCD these methods can be applied to real QCD with higher confidence. Lattice studies were made with staggered fermions [11,13,12,14,15,16,17,18] for N f = 4 or, more recently, N f = 2 and Wilson fermions [19,20,21,22,23,24] for N f = 2 mostly.…”