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

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Title
The Effects of dark matter-baryon scattering on redshifted 21 cm signals
Author(s)
Tashiro, H; Kenji Kadota; Silk, J
Publication Date
2014-10
Journal
PHYSICAL REVIEW D, v.90, no.8, pp.083522 -
Publisher
AMER PHYSICAL SOC
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 observa- tional 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 bright- nesstemperature 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 md ∼ 1 GeV), and such an effect would be of great interest for probing the nature of DM in view of forthcoming cosmological surveys.
URI
http://pr.ibs.re.kr/handle/8788114/1456
DOI
10.1103/PhysRevD.90.083522
ISSN
1550-7998
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
Files in This Item:
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