Thermal quarks and gluon propagators in two-color dense QCD

We study Landau gauge gluon propagators in two-color QCD at a finite quark chemical potential (mu(q)) and temperature (T). We include medium polarization effects at the one loop by quarks into massive gluon propagators and compare the analytic results with the available lattice data. We particularly focus on the high density phase of color-singlet diquark condensates whose critical temperature is similar to 100 MeV with a weak dependence on mu(q). At zero temperature, the color singlet condensates protect the IR limit of electric and magnetic gluon propagators from the medium screening effects. At a finite temperature, this behavior remains true for the magnetic sector, but the electric screening mass should be generated by thermal, and hence gapless, particles which are unbound from the diquark condensates. Treating thermal excitations as quasiquarks, we found that the electric screening develops too fast as compared to the lattice results. Beyond the critical temperature for diquark condensates, the analytic results are consistent with the lattice results.

Automated summary

The study focused on Landau gauge gluon propagators in two-color QCD at finite quark chemical potential and temperature, comparing analytic results with lattice data. High density phase of color-singlet diquark condensates and the impact at zero and finite temperature were particularly examined. Analysis showed consistency with lattice results beyond the critical temperature for diquark condensates.