Speaker
Description
We investigate the chemical-potential ($\mu$) dependence of gluon screening masses in two-color QCD ($\mathrm{QC_2D}$) at finite density using lattice simulations.
Previous studies on this topic have reported conflicting results. One group concluded that both the electric and magnetic screening masses are independent of $\mu$, whereas another reported that the electric screening mass increases with $\mu$.
To resolve this discrepancy, we calculate the gluon propagator in the Landau gauge and extract the screening masses at various chemical potentials and at several temperatures, $T \simeq 40, 106,$ and $127~\mathrm{MeV}$.
Our results show that the magnetic screening mass remains independent of $\mu$ at all temperatures. In contrast, the electric screening mass exhibits a clear temperature dependence: it is independent of $\mu$ at low temperature, $T \simeq 40~\mathrm{MeV}$, while it increases with $\mu$ at higher temperatures, $T \simeq 106$ and $127~\mathrm{MeV}$.
This high-temperature behavior is qualitatively consistent with the $\mu$ dependence predicted by effective models. These findings suggest that the discrepancy between the two previous studies arises from finite-temperature effects.