Cosmic microwave background spectral distortions information
Fluctuations in the energy spectrum of the microwave background
CMB spectral distortions are tiny departures of the average cosmic microwave background (CMB) frequency spectrum from the predictions given by a perfect black body. They can be produced by a number of standard and non-standard processes occurring at the early stages of cosmic history, and therefore allow us to probe the standard picture of cosmology. Importantly, the CMB frequency spectrum and its distortions should not be confused with the CMB anisotropy power spectrum, which relates to spatial fluctuations of the CMB temperature in different directions of the sky.[1]
Spectral distortions at different cosmological epochs. At very early times, with redshift , any injection of energy emerges as a temperature shift in the black body. As the age of the Universe increases, the processes that lead to thermalization of CMB distortions to a blackbody become less efficient (bremsstrahlung and double Compton scattering when , Compton scattering when ). The spectral distortions also interplay with distinguished epochs of cosmic history such as reionization, recombination and Big Bang nucleosynthesis as shown. Specifically, during the recombination epoch ( years after the Big Bang), the cosmological recombination lines are imprinted on the CMB as a result of non-equilibrium atomic processes during that era [2]
^ McKee, Maggie (30 June 2015). "Why the Big Bang's Light May Have a Tilt". Quanta. Simons Foundation. Retrieved 7 July 2021.
^Cite error: The named reference Voyage2050 was invoked but never defined (see the help page).
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