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I compute the gluon self-energy in a color superconductor with two flavors ofmassless quarks, where condensation of Cooper pairs breaks SU(3)_c to SU(2)_c.At zero temperature, there is neither Debye screening nor a Meissner effect forthe three gluons of the unbroken SU(2)_c subgroup. The remaining five gluonsattain an electric as well as a magnetic mass. For temperatures approaching thecritical temperature for the onset of color superconductivity, or for gluonmomenta much larger than the color-superconducting gap, the self-energy assumesthe form given by the standard hard-dense loop approximation. The gluonself-energy determines the coefficient of the kinetic term in the effectivelow-energy theory for the condensate fields.Comment: 29 pages, RevTe

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