Thermal photon dispersion law and modified black-body spectra

Based on the postulate that photon propagation is governed by an SU(2) gauge principle we numerically compute the one-loop dispersion for thermalized photon propagation on the radiatively induced mass shell. Formerly, the dispersion was addressed by assuming p = 0. While this approximation turns out to be excellent for temperatures ≤ 2TCMB the exact result exhibits a much faster (power-like) shrinking of the gap in the black-body spectral intensity with rising temperature. Also, the screening function G now saturates to finite values as the spatial momentum approaches zero. Our previous statements on anomalous large-angle CMB temperature-temperature correlations, obtained in the approximation p = 0, remain valid.