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The evolution of CMB spectral distortions in the early Universe

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Chluba, J., Sunyaev, R. A.·2012·Monthly Notices of the Royal Astronomical Society

Abstract

The energy spectrum of the cosmic microwave background (CMB) allows constraining episodes of energy release in the early Universe. In this paper we revisit and refine the computations of the cosmological thermalization problem. For this purpose a new code, called CosmoTherm, was developed that allows solving the coupled photon-electron Boltzmann equation in the expanding, isotropic Universe for small spectral distortion in the CMB. We explicitly compute the shape of the spectral distortions caused by energy release due to (i) annihilating dark matter; (ii) decaying relict particles; (iii) dissipation of acoustic waves; and (iv) quasi-instantaneous heating. We also demonstrate that (v) the continuous interaction of CMB photons with adiabatically cooling non-relativistic electrons and baryons causes a negative mu-type CMB spectral distortion of DI_nu/I_nu ~ 10^{-8} in the GHz spectral band. We solve the thermalization problem including improved approximations for the double Compton and Bremsstrahlung emissivities, as well as the latest treatment of the cosmological recombination process. At redshifts z

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Metadata

Authors
Chluba, J., & Sunyaev, R. A.
Venue
Monthly Notices of the Royal Astronomical Society
Published
2011-11-11
Volume
419
Issue
2
Pages
1294-1314
ISSN
0035-8711 (ISSN-L)
OpenAlex
W2160902691
Cited by
385
References
4
FWCI
8.81
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: The evolution of CMB spectral distortions in the early Universe. https://app.cochat.ai/papers/10.1111/j.1365-2966.2011.19786.x
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Chluba, J., & Sunyaev, R. A. (2012). The evolution of CMB spectral distortions in the early Universe. Monthly Notices of the Royal Astronomical Society. https://doi.org/10.1111/j.1365-2966.2011.19786.x

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