Towards the phase diagram of dense two-color matter

Understand

We study two-color QCD with two flavors of Wilson fermion as a function of quark chemical potential mu and temperature T.

• We find evidence of a superfluid phase at intermediate mu and low T where the quark number density and diquark condensate are both very well described by a Fermi sphere of nearly-free quarks disrupted by a BCS condensate.
• Our results suggest that the quark contribution to the energy density is negative (and balanced by a positive gauge contribution), although this result is highly sensitive to details of the energy renormalisation.
• We also find evidence that the chiral condensate in this region vanishes in the massless limit.