Longitudinal gluons and Nambu-Goldstone bosons in a two-flavor color superconductor
- 30 September 2002
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 66 (5), 054019
- https://doi.org/10.1103/physrevd.66.054019
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.Keywords
Other Versions
This publication has 17 references indexed in Scilit:
- Collective modes of color–flavor locked phase of dense QCD at finite temperatureNuclear Physics A, 2002
- Masses of the pseudo Nambu-Goldstone bosons in the two flavor color superconducting phasePhysical Review D, 2001
- Gluon self-energy in a two-flavor color superconductorPhysical Review D, 2001
- The nonperturbative color Meissner effect in a two-flavor color superconductorNuclear Physics B, 2000
- Debye screening and the Meissner effect in a two-flavor color superconductorPhysical Review D, 2000
- The effective potential of composite diquark fields and the spectrum of resonances in dense QCDPhysics Letters B, 1999
- Quark description of hadronic phasesPhysical Review D, 1999
- Diquark Bose Condensates in High Density Matter and InstantonsPhysical Review Letters, 1998
- QCD at finite baryon density: nucleon droplets and color superconductivityPhysics Letters B, 1998
- Superfluidity and superconductivity in relativistic fermion systemsPhysics Reports, 1984