Color screening in cold quark matter
arXiv:1404.1346 · doi:10.1103/PhysRevD.89.125008
Abstract
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.
20 pages, 10 figures; v2 published version in PRD
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- Phenomenological neutron star equations of state: 3-window modeling of QCD matter
- Gluon propagator in two-color dense QCD: Massive Yang-Mills approach at one-loop
- Effects of Dense Quark Matter on Gluon Propagators in Lattice QCD
- Thermal quarks and gluon propagators in two-color dense QCD
- The quark mass gap in strong magnetic fields
- Sound velocity peak induced by the chiral partner in dense two-color QCD
- Delineating chiral separation effect in two-color dense QCD
- Thermal effects on sound velocity peak and conformality in isospin QCD
- Zero point energy of composite particles: The medium effects
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