Low-frequency line temperatures of the CMB

Based on SU(2) Yang-Mills thermodynamics we interprete Aracde2’s and the results of earlier radio-surveys on low-frequency CMB line temperatures as a phase-boundary effect. We explain the excess at low frequencies by evanescent, nonthermal photon fields of the CMB whose intensity is nulled by that of Planck distributed calibrator photons. The CMB baseline temperature thus is identified with the critical temperature of the deconfining-preconfining transition. Introduction. Activities to detect deviations of the CMB spectrum from an ideal black-body shape and to extract angular correlation functions from carefully generated CMB maps are numerous and insightful [1, 2]. In particular, the observational situation at low frequencies [3, 4, 5, 6, 7, 8] and large-angles [2, 9], respectively, has generated genuine surprises. We are convinced that these anomalies necessitate changing our present theoretical concept on photon physics [10]. Specifically, we mean a replacement of the gauge group U(1) by SU(2), the latter being treated nonperturbatively [11, 12, 13, 14]. This Letter intends to spell out a topical experimental reason confirming this. Recent data on CMB line temperatures T at lowfrequencies (ν = 3GHz ... 90GHz) [3], determined by nulling the difference between CMB (cleared of galactic emission) and black-body calibrator spectral intensities, indicate a statistically significant (5 σ) excess at the lowest frequencies. Combining this with earlier radio-frequency data on forground subtracted antenna temperatures [5, 6, 7, 8], a fit to an affine power law