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arxiv: 0707.2727 · v1 · submitted 2007-07-18 · 🌌 astro-ph

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Linear effects of perturbed recombination

Antony Lewis
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classification 🌌 astro-ph
keywords perturbationstemperaturebaryonevolutionfractionionizationperturbationrecombination
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Perturbations in the ionization fraction after recombination affect the Compton cooling of density perturbations. Once the gas temperature starts to decouple from the CMB temperature, ionization fraction perturbations can have a significant influence on the subsequent gas temperature perturbation evolution. This directly affects the 21cm spin temperature of the gas, and also modifies the small-scale baryon perturbation evolution via the difference in baryon pressure. The effect on the gas temperature perturbations can be significant on all scales, and galactic-scale baryon perturbations are modified at the percent level at redshifts z >~ 100 where numerical simulations are typically started.

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