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

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

2002-05-30

arxiv.org/abs/nucl-th/0205080v2

Phys.Rev. D66 (2002) 054019

Physics

Nuclear Physics

Nuclear Theory

16 pages, 4 figures, minor revisions to text, one ref. added

Scientific paper

10.1103/PhysRevD.66.054019

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.

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