# Deconfinement in dense 2-colour QCD

**Source**: https://www.maths.tcd.ie/report_series/abstracts/tcdm0604.html
**Parent**: https://www.maths.tcd.ie/research/papers/

**Deconfinement in dense 2-colour QCD**

We study SU(2) lattice gauge theory with two flavors of
Wilson fermion at non-zero chemical potential mu and low temperature
on a 8^3x16 system. We identify three régimes along the mu-axis. For
mu<~m\_pi/2 the system remains in the vacuum phase, and all physical
observables considered remain essentially unchanged. The intermediate
régime is characterised by a non-zero diquark condensate and an
associated increase in the baryon density, consistent with what is
expected for Bose-Einstein condensation of tightly bound diquarks. We
also observe screening of the static quark potential here. In the
high-density deconfined régime we find a non-zero Polyakov loop and a
strong modification of the gluon propagator, including significant
screening in the magnetic sector in the static limit, which must have
a non-perturbative origin. The behaviour of thermodynamic observables
and the superfluid order parameter are consistent with a Fermi surface
disrupted by a BCS diquark condensate. The energy per baryon as a
function of mu exhibits a minimum in the deconfined régime, implying
that macroscopic objects such as stars formed in this theory are
largely composed of quark matter.