Heating of baryons due to scattering with dark matter during the dark ages

@article{Muoz2015HeatingOB,
  title={Heating of baryons due to scattering with dark matter during the dark ages},
  author={Julian B. Mu{\~n}oz and Ely D. Kovetz and Yacine Ali-Haimoud},
  journal={Physical Review D},
  year={2015},
  volume={92},
  pages={083528}
}
We explore the effects of elastic scattering between dark matter and baryons on the 21-cm signal during the dark ages. In particular, we consider a dark-matter---baryon interaction with a cross section of the form $\sigma = \sigma_0 v^{-4}$, in which case the effect of the drag force between the dark matter and baryon fluids grows with time. We show that, as opposed to what was previously thought, this effect heats up the baryons due to the relative velocity between dark matter and baryons… 

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