Journal article 508 views
Deconfinement in dense 2-color QCD / S Hands; S Kim; J.-I Skullerud; Simon Hands
Pages: 193 - 206
Swansea University Author: Simon, Hands
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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...
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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.
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