Longitudinal gluons and Nambu-Goldstone bosons in a two-flavor color superconductor

2002/05/31 by Dirk H. Rischke, I. A. Shovkovy, Igor A. Shovkovy · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Chiral symmetry breaking #Color superconductivity #Diquark #Gauge boson #Gauge theory #Gluon #Goldstone boson #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum electrodynamics #Quark–gluon plasma #Strange matter #Symmetry breaking #cond-mat.supr-con #hep-ph #nucl-th

paper · pdf · doi:10.1103/physrevd.66.054019

published as Phys.Rev. D66 (2002) 054019 · 16 pages, 4 figures, minor revisions to text, one ref. added

arxiv created 2002/06/12 · openalex publication_date 2002/09/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

In a two-flavor color superconductor, the SU(3)_c gauge symmetry is spontaneously broken by diquark condensation. The Nambu-Goldstone excitations of the diquark condensate mix with the gluons associated with the broken generators of the original gauge group. It is shown how one can decouple these modes with a particular choice of 't Hooft gauge. We then explicitly compute the spectral density for transverse and longitudinal gluons of adjoint color 8. The Nambu-Goldstone excitations give rise to a singularity in the real part of the longitudinal gluon self-energy. This leads to a vanishing gluon spectral density for energies and momenta located on the dispersion branch of the Nambu-Goldstone excitations.

Citations

• The effective potential of composite diquark fields and the spectrum of resonances in dense QCD
• QCD at finite baryon density: nucleon droplets and color superconductivity
• Low energy theory for 2 flavors at high density QCD
• Superconductivity from perturbative one-gluon exchange in high density quark matter

Cited by

• Screening masses in a neutral two-flavor color superconductor