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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

Abstract

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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Published: 2006
URI: https://cronfa.swan.ac.uk/Record/cronfa1540
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spelling 2011-10-01T00:00:00.0000000 v2 1540 2011-10-01 Deconfinement in dense 2-color QCD b34293f7370adc1d2cac9b93717a61c7 Simon Hands Simon Hands true false 2011-10-01 FGSEN 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. Journal Article 193 206 31 12 2006 2006-12-31 10.1140/epjc/s2006-02621-8 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 NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2011-10-01T00:00:00.0000000 2011-10-01T00:00:00.0000000 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics S Hands 1 S Kim 2 J.-I Skullerud 3 Simon Hands 4
title Deconfinement in dense 2-color QCD
spellingShingle Deconfinement in dense 2-color QCD
Simon Hands
title_short Deconfinement in dense 2-color QCD
title_full Deconfinement in dense 2-color QCD
title_fullStr Deconfinement in dense 2-color QCD
title_full_unstemmed Deconfinement in dense 2-color QCD
title_sort Deconfinement in dense 2-color QCD
author_id_str_mv b34293f7370adc1d2cac9b93717a61c7
author_id_fullname_str_mv b34293f7370adc1d2cac9b93717a61c7_***_Simon Hands
author Simon Hands
author2 S Hands
S Kim
J.-I Skullerud
Simon Hands
format Journal article
container_start_page 193
publishDate 2006
institution Swansea University
doi_str_mv 10.1140/epjc/s2006-02621-8
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 0
active_str 0
description 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.
published_date 2006-12-31T03:04:12Z
_version_ 1763749556775813120
score 11.036706

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