2014/04/30 by Toru Kojo, Gordon Baym · 1 citation
Physics and Astronomy · #Bottom quark #Cold Atom Physics and Bose-Einstein Condensates #Color superconductivity #Diquark #Gluon #Higgs boson #High-Energy Particle Collisions Research #Nuclear physics #Particle physics #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum electrodynamics #Quark #Singlet state #Strange matter #Top quark #Up quark #hep-lat #hep-ph #hep-th #nucl-th
paper · pdf · doi:10.1103/physrevd.89.125008
published as Phys. Rev. D 89, 125008 (2014) · 20 pages, 10 figures; v2 published version in PRD
arxiv created 2014/06/04 · openalex publication_date 2014/06/10 · arxiv updated 2014/12/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We compute---at finite quark chemical potentials---the color screening of cold quark matter at the one-loop level, comparing the normal, BCS-paired U(1)em (or Higgs) phase and a singlet phase with color-singlet condensate near the Fermi surface. The latter phase is computed using the example of two-color QCD with a color-singlet diquark condensate. In contrast to the normal and Higgs phases, neither electric nor magnetic screening masses appear in the singlet phase. The absence of a magnetic mass, within a perturbative framework, is a consequence of the proper treatment of gauge invariance. While at large momenta the gluon self-energies approach those in the normal phase, the medium contributions to the infrared region below a scale of the mass gap are substantially suppressed. Infrared gluons at low quark density in the singlet phase appear protected from medium effects, unless the quark-gluon vertices are significantly enhanced in the infrared.