Journal
PHYSICAL REVIEW RESEARCH
Volume 2, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.2.013210
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Funding
- INAF PRIN SKA/CTA project FORECaST
- ASI/Physics Department of the University of Roma-Tor Vergata [2016-24-H.0]
- research program RITMARE [SP3 WP3 AZ3 U02]
- Progetto di Ricerca Dipartimentale Grant [BIRD173122/17]
- MIUR grant from the Dipartimenti di Eccellenza
- research contract SMO at CNR/ISMAR
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Cosmic background radiation has been observed to deviate from the Planck law expected from a blackbody at similar to 2.7 K at frequencies below similar to 3 GHz. We discuss the abundance of the low-energy photons from the perspective of nonequilibrium statistical mechanics. We propose a mechanism of stochastic frequency diffusion, the counterpart to stochastic acceleration for charged particles in a turbulent plasma, to modify the standard Kompaneets equation. The resulting violation of the Einstein relation allows us to take advantage of low-frequency localization and finally leads to photon cooling. The modified equation predicts a frequency distribution in agreement with the absolute temperature measurements of the cosmic background radiation down to about 20 MHz, for which we offer an updated compilation. In that sense, the so-called space roar we observe today is interpreted as a nonequilibrium echo of the early universe and more specifically of nonequilibrium conditions in the primordial plasma.
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