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Unavoidable CMB spectral features and blackbody photosphere of our Universe

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arxiv 1302.6553 v2 pith:MSKCJXXN submitted 2013-02-26 astro-ph.CO hep-ph

Unavoidable CMB spectral features and blackbody photosphere of our Universe

classification astro-ph.CO hep-ph
keywords spectraldistortionsfeaturesuniverseduringinformationotherreionization
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Spectral features in the CMB energy spectrum contain a wealth of information about the physical processes in the early Universe, z < 2 x 10^6. The CMB spectral distortions are complementary to all other probes of cosmology. In fact, most of the information contained in the CMB spectrum is inaccessible by any other means. This review outlines the main physics behind the spectral features in the CMB throughout the history of the Universe, concentrating on the distortions which are inevitable and must be present at a level observable by the next generation of proposed CMB experiments. The spectral distortions considered here include spectral features from cosmological recombination, resonant scattering of CMB by metals during reionization which allows us to measure their abundances, y-type distortions during and after reionization and \mu-type and i-type (intermediate between \mu and y) distortions created at redshifts z > 1.5 x 10^4.

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Cited by 1 Pith paper

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  1. The Glow of Axion Quark Nugget Dark Matter: (IV) CMB Spectral and Anisotropy Signatures

    astro-ph.CO 2025-12 conditional novelty 5.0

    Axion quark nugget dark matter would create a μ-type CMB spectral distortion near 6×10⁻⁸ with y near 2×10⁻⁹, detectable by proposed missions, while leaving CMB anisotropies essentially unchanged.