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Matter temperature after cosmological recombination

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arxiv 0902.3438 v2 pith:O4GLNRXB submitted 2009-02-19 astro-ph.CO

Douglas Scott , Adam Moss This is my paper · ORCID
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keywords decouplingmatterradiationtemperatureastrophysicalatomicbackgroundcompton
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The temperature of the atomic matter in the Universe is held to that of the Cosmic Background radiation until decoupling at z~100. After this it cools faster than the radiation (\propto(1+z)^2 rather than (1+z)) and would have fallen to about 20mK today if astrophysical feedback processes had not heated up the interglactic medium. We show how the derivative of the Compton coupling equation helps numerically to follow the decoupling process.

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    astro-ph.CO 2025-01 conditional novelty 4.0 of 10

    An implementation of the Passaglia-Hu effective fluid approximation in CAMB achieves accurate CMB predictions for ultralight axions and yields new upper limits on their abundance from Planck PR4 and DESI BAO data.

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