Journal article 534 views
Deconfinement in dense 2-color QCD / S Hands; S Kim; J.-I Skullerud; Simon Hands
Pages: 193 - 206
Swansea University Author: Simon, Hands
Full text not available from this repository: check for access using links below.
DOI (Published version): 10.1140/epjc/s2006-02621-8
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 regimes along the mu-axis. For mu<~m_pi/2 the system remains in the vacuum phase, and all physical observables considered remain essen...
No Tags, Be the first to tag this record!
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 regimes 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 regime 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 regime 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 regime, implying that macroscopic objects such as stars formed in this theory are largely composed of quark matter.
First study of a QCD-like theory at non-zero baryon density to identify a deconfined phase at high chemical potential, where thermodynamic scaling is consistent with degenerate quark matter, and there is evidence for a significant gluon energy density accompanied by non-perturbative screening of static magnetic gluons.
College of Science