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The Effects of Dark Matter-Baryon Scattering on Redshifted 21 cm Signals

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arxiv 1408.2571 v1 pith:BVFCC6IY submitted 2014-08-11 astro-ph.CO hep-ph

Hiroyuki Tashiro , Kenji Kadota , Joseph Silk This is my paper · ORCID
classification astro-ph.COhep-ph
keywords crosspowerscatteringsectionspectrumtemperatureangularbaryons
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abstract

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 DM mass of 10 GeV, the 21 cm brightness temperature angular power spectrum can be suppressed by a factor 2 within the currently allowed DM-baryon cross section bounded by the CMB and large-scale structure data. This scale-independent suppression of the angular power spectrum can be even larger for a smaller DM mass with a common cross section (for instance, as large as a factor 10 for $m_d\sim 1$ GeV), and such an effect would be of great interest for probing the nature of DM in view of forthcoming cosmological surveys.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Reviving Millicharged Dark Matter for 21-cm Cosmology

    hep-ph 2019-08 conditional novelty 7.0 of 10

    Adding a long-range interaction between a millicharged dark matter subcomponent and the dominant cold dark matter lets the dark sector act as a heat sink, reviving the millicharged explanation of the EDGES 21-cm anomaly.

  2. New Limits on Charged Dark Matter from Large-Scale Coherent Magnetic Fields

    astro-ph.CO 2019-08 conditional novelty 7.0 of 10

    The intact interstellar gas disk of the Milky Way implies charged dark matter must have charge-to-mass ratio below about 10^-13 e/GeV, unless it makes up only a small fraction of dark matter.

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