  The infrared divergence of the self-energy of a color charge is due to an
enhancement of the long wavelength modes of the color Coulomb potential field.
There are also long wavelength contributions to the QCD vacuum energy that are
similarly enhanced. Vacuum modes of Hubble scale wavelengths may be affected in
a cosmological setting and this can lead to a residual positive energy density
of the form $H^d\Lambda_{\rm QCD}^{4-d}$. Lattice studies constrain $d$. If the
dark energy takes this form then the universe is driven towards de Sitter
expansion, and we briefly study this cosmology when $d$ is just slightly above
unity.
