Universality of phase diagrams in QCD and QCD-like theories

Understand

We show the universality of phase diagrams in QCD and QCD-like theories through the large-N_c equivalence.

• The whole phase diagrams are identical between QCD at finite isospin chemical potential and SO(2N_c) and Sp(2N_c) gauge theories at finite baryon chemical potential.
• In the chiral limit, they are also identical to that of QCD at finite chiral chemical potential.
• Outside the pion or diquark condensed phase in these theories, the universality of phase diagrams is applicable to QCD at finite baryon chemical potential.