Debye screening and the Meissner effect in a two-flavor color superconductor

I compute the gluon self-energy in a color superconductor with two flavors of massless quarks, where condensation of Cooper pairs breaks ${\mathrm{SU}\left(3\right)\mathrm{}}_c$ to ${\mathrm{SU}\left(2\right)\mathrm{}}_c.$ At zero temperature, there is neither Debye screening nor a Meissner effect for the three gluons of the unbroken ${\mathrm{SU}\left(2\right)\mathrm{}}_c$ subgroup. The remaining five gluons attain an electric as well as a magnetic mass. For temperatures approaching the critical temperature for the onset of color superconductivity, or for gluon momenta much larger than the color-superconducting gap, the self-energy assumes the form given by the standard hard-dense loop approximation. The gluon self-energy determines the coefficient of the kinetic term in the effective low-energy theory for the condensate fields.