QCD with (2+1) flavors at the physical point in external chromomagnetic fields

TL;DR

This study explores how uniform chromomagnetic fields influence the chiral condensate and deconfinement temperature in full QCD with (2+1) flavors at the physical point, revealing catalysis effects and temperature hysteresis.

Contribution

It provides the first detailed analysis of the effects of external chromomagnetic fields on full QCD with physical quark masses, including the behavior of chiral condensates and critical temperatures.

Findings

Chromomagnetic catalysis occurs in the confined phase.

Inverse catalysis appears at high temperatures.

Deconfinement temperature varies with field strength, decreasing then increasing.

Abstract

We investigate full QCD with (2+1)-flavour of HISQ fermions at the physical point in the presence of uniform Abelian chromomagnetic background fields. Our focus is on the renormalized light and strange chiral condensate around the pseudo-critical temperature. We find that in the confined region the gauge system is subjected to the chromomagnetic catalysis that turns into the inverse catalysis in the high-temperature regime. We further observe that the chiral condensates are subjected to the so-called thermal hysteresis. Our estimate of the deconfinement temperature indicates that the critical temperature begins to decrease in the small field region, soon after it seems to saturate and finally increase with the strength of the chromomagnetic field.