  We investigate the spectrum of the Faddeev-Popov operator in Coulomb gauge
QCD using quenched SU(3) lattice simulation. In the confinement phase, we
observe the accumulation of the near-zero modes of the FP operator at large
lattice volumes, and the color-Coulomb self-energy diverges in the infrared
limit. Moreover, even in the deconfinement phase, the behavior of the FP
eigenvalue density is qualitatively the same as in the confinement phase and
the color-Coulomb self-energy is infrared divergent.
