Dense 2-color QCD towards continuum and chiral limits

TL;DR

This study investigates two-color QCD with Wilson fermions across various lattice spacings and quark masses, revealing how the quarkyonic region and thermodynamic properties approach continuum and chiral limits, highlighting the behavior of quark density and pressure.

Contribution

It provides new insights into the continuum and chiral limit behaviors of two-color QCD, especially regarding the quarkyonic phase and thermodynamic limits.

Findings

Quarkyonic region extends with decreasing lattice spacing or quark mass.

Quark number density approaches non-interacting values.

Pressure approaches Stefan-Boltzmann limit from below.

Abstract

We study two-color QCD with two flavors of Wilson fermion as a function of quark chemical potential mu and temperature T, for two different lattice spacings and two different quark masses. We find that the quarkyonic region, where the behaviour of the quark number density and the diquark condensate are described by a Fermi sphere of almost free quarks distorted by a BCS gap, extends to larger chemical potentials with decreasing lattice spacing or quark mass. In both cases, the quark number density also approaches its non-interacting value. The pressure at low temperature is found to approach the Stefan-Boltzmann limit from below.