Abstract
We calculate the photon dispersion relations generated by the quark loop in a quark-gluon plasma with the color A0-background condensate \( A_0^c = A_0^{c3} + A_0^{c8} = {\rm const}\) . It is found that both transversal and longitudinal modes are exited. They have a gap at low momenta and are stable in the high-temperature approximation. The background fields act as imaginary chemical potentials and decrease the photon frequencies compared to the case of zero background. This has phenomenological consequences, in particular, for direct photons radiated from plasma. Comparisons with the QED plasma with a chemical potential are discussed.
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