Comments on "Three regimes of QCD" by L.Glozman

Abstract

There are no "three regimes of QCD", as speculated in that paper. There are only two, separated by already well known $T_c\sim 155\, MeV$. Above it electric interactions are screened rather then confined. Magnetic ones remain confined all the way to $T\rightarrow \infty$. Spectrum of "mesonic screening masses" is there, but they do not represent real masses. At high $T$ they correspond to "heavy quarkonia" of 2+1 d gauge theory, which is well known to be a confining theory. There is no reason to expect any transition unbinding them, at $T\sim 1\, GeV$ as claimed. I make calculation of correction to screening masses in 2+1d at high temperature including spatial screening tension and find results in agreement with recent lattice data.