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http://hdl.handle.net/20.500.12386/31159
Titolo: | On a possible nonequilibrium imprint in the cosmic background at low frequencies | Autori: | Marco Baiesi BURIGANA, CARLO Livia Conti Gianmaria Falasco Christian Maes Lamberto Rondoni Tiziana Trombetti |
Data pubblicazione: | 2020 | Rivista: | PHYSICAL REVIEW RESEARCH | Numero: | 2 | Fascicolo: | 1 | Abstract: | The cosmic background radiation has been observed to deviate from the Planck law expected from a blackbody at $\sim$ 2.7 K at frequencies below $\sim 3$ 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 to take advantage of low-frequency localization and finally leads to photon cooling. The new 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 here 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 of nonequilibrium conditions in the primordial plasma more specifically. | URI: | http://hdl.handle.net/20.500.12386/31159 | URL: | http://arxiv.org/abs/1908.08876v4 https://journals.aps.org/prresearch/pdf/10.1103/PhysRevResearch.2.013210 |
ISSN: | 2643-1564 | DOI: | 10.1103/PhysRevResearch.2.013210 | Bibcode ADS: | 2020PhRvR...2a3210B | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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1908.08876_postprint_including_erratum.pdf | postprint | 745.78 kB | Adobe PDF | Visualizza/apri |
PhysRevResearch.2.013210.pdf | Pdf editoriale | 771.6 kB | Adobe PDF | Visualizza/apri |
PhysRevResearch.2.049001.pdf | Erratum - auxiliary information | 244.96 kB | Adobe PDF | Visualizza/apri |
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