Speaker
Description
We present the results of a low-temperature scan of the phase diagram of
dense two-color QCD with N_f = 2 quarks. The study is conducted using lattice simulation
with rooted staggered quarks. At small chemical potential we observe the hadronic phase,
where the theory is in a confining state, chiral symmetry is broken, the baryon density is
zero and there is no diquark condensate. At the critical point \mu = m_{\pi}/2 we observe the
expected second order transition to Bose-Einstein condensation of scalar diquarks. In this
phase the system is still in confinement in conjunction with nonzero baryon density, but
the chiral symmetry is restored in the chiral limit. We have also found that in the first
two phases the system is well described by chiral perturbation theory. For larger values
of the chemical potential the system turns into another phase, where the relevant degrees
of freedom are fermions residing inside the Fermi sphere, and the diquark condensation
takes place on the Fermi surface. In this phase the system is still in confinement, chiral
symmetry is restored and the system is very similar to the quarkyonic state predicted by
SU(N_c) theory at large N_c.
