Decoupling of quark condensate from the effective nucleon mass at high density (ϱ) and temperature (T)

It is found that the quark condensate 〈qq〉, instead of decreasing at high ϱ, as commonly expected, starts to increase after a certain density (∼ 1.5ϱ0 — in standard relativistic nuclear matter models. However, when the models contain coupling constants which are density dependent, 〈qq〉 → 0 at high ϱ and T, and in addition, the effective nucleon mass changes little, showing a decoupling of the mass from the condensate.