The Effects of dark matter-baryon scattering on redshifted 21 cm signals

  title={The Effects of dark matter-baryon scattering on redshifted 21 cm signals},
  author={Hiroyuki Tashiro and Kenji Kadota and Joseph I. Silk},
  journal={Physical Review D},
We demonstrate that elastic scattering between dark matter (DM) and baryons can affect the thermal evolution of the intergalactic medium at early epochs and discuss the observational consequences. We show that, due to the interaction between DM and baryons, the baryon temperature is cooled after decoupling from the CMB temperature. We illustrate our findings by calculating the 21 cm power spectrum in coexistence with a velocity-dependent DM elastic scattering cross section. For instance, for a… 

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