Rapid onset of the 21-cm signal suggests a preferred mass range for dark
matter particle
V. Vipp, A. Hektor, and G. Hütsi. (2021)cite arxiv:2103.07462Comment: Prepared for submission to PRD. Comments welcome!.
Abstract
We are approaching a new era to probe the 21-cm neutral hydrogen signal from
the period of cosmic dawn. This signal offers a unique window to the virgin
Universe, e.g., to study dark matter models with different small-scale
behaviours. The EDGES collaboration has recently published the first results of
the global 21-cm spectrum. We demonstrate that such a signal can be used to
set, unlike most observations concerning dark matter, both lower and upper
limits for the mass of dark matter particles. We study the 21-cm signal
resulting from a simple warm dark matter model with a sharp-$k$ window function
calibrated for high redshifts. We tie the PopIII star formation to Lyman-alpha
and radio background production. Using MCMC to sample the parameter space we
find that to match the EDGES signal, a warm dark matter particle must have a
mass of $7.3^+1.6_-3.3$ keV at 68\% confidence interval. This translates to
$2.2^+1.4_-1.7 10^-20$ eV for fuzzy dark matter and
$63^+19_-35$ keV for Dodelson-Widrow sterile neutrinos. Cold dark matter is
unable to reproduce the signal due to its slow structure growth.
Description
Rapid onset of the 21-cm signal suggests a preferred mass range for dark matter particle
%0 Generic
%1 vipp2021rapid
%A Vipp, Venno
%A Hektor, Andi
%A Hütsi, Gert
%D 2021
%K tifr
%T Rapid onset of the 21-cm signal suggests a preferred mass range for dark
matter particle
%U http://arxiv.org/abs/2103.07462
%X We are approaching a new era to probe the 21-cm neutral hydrogen signal from
the period of cosmic dawn. This signal offers a unique window to the virgin
Universe, e.g., to study dark matter models with different small-scale
behaviours. The EDGES collaboration has recently published the first results of
the global 21-cm spectrum. We demonstrate that such a signal can be used to
set, unlike most observations concerning dark matter, both lower and upper
limits for the mass of dark matter particles. We study the 21-cm signal
resulting from a simple warm dark matter model with a sharp-$k$ window function
calibrated for high redshifts. We tie the PopIII star formation to Lyman-alpha
and radio background production. Using MCMC to sample the parameter space we
find that to match the EDGES signal, a warm dark matter particle must have a
mass of $7.3^+1.6_-3.3$ keV at 68\% confidence interval. This translates to
$2.2^+1.4_-1.7 10^-20$ eV for fuzzy dark matter and
$63^+19_-35$ keV for Dodelson-Widrow sterile neutrinos. Cold dark matter is
unable to reproduce the signal due to its slow structure growth.
@misc{vipp2021rapid,
abstract = {We are approaching a new era to probe the 21-cm neutral hydrogen signal from
the period of cosmic dawn. This signal offers a unique window to the virgin
Universe, e.g., to study dark matter models with different small-scale
behaviours. The EDGES collaboration has recently published the first results of
the global 21-cm spectrum. We demonstrate that such a signal can be used to
set, unlike most observations concerning dark matter, both lower and upper
limits for the mass of dark matter particles. We study the 21-cm signal
resulting from a simple warm dark matter model with a sharp-$k$ window function
calibrated for high redshifts. We tie the PopIII star formation to Lyman-alpha
and radio background production. Using MCMC to sample the parameter space we
find that to match the EDGES signal, a warm dark matter particle must have a
mass of $7.3^{+1.6}_{-3.3}$ keV at 68\% confidence interval. This translates to
$2.2^{+1.4}_{-1.7} \times 10^{-20}$ eV for fuzzy dark matter and
$63^{+19}_{-35}$ keV for Dodelson-Widrow sterile neutrinos. Cold dark matter is
unable to reproduce the signal due to its slow structure growth.},
added-at = {2021-03-15T06:03:07.000+0100},
author = {Vipp, Venno and Hektor, Andi and Hütsi, Gert},
biburl = {https://www.bibsonomy.org/bibtex/2f85c991cceb281c9b1188d1a4d7287b9/citekhatri},
description = {Rapid onset of the 21-cm signal suggests a preferred mass range for dark matter particle},
interhash = {655cda14517c95e310e6cddd0e0fd8af},
intrahash = {f85c991cceb281c9b1188d1a4d7287b9},
keywords = {tifr},
note = {cite arxiv:2103.07462Comment: Prepared for submission to PRD. Comments welcome!},
timestamp = {2021-03-15T06:03:07.000+0100},
title = {Rapid onset of the 21-cm signal suggests a preferred mass range for dark
matter particle},
url = {http://arxiv.org/abs/2103.07462},
year = 2021
}