Dark matter-baryon interactions can cool the baryonic fluid, which has been
shown to modify the cosmological 21-cm global signal. We show that in a
two-component dark sector with an interacting millicharged component, dark
matter-baryon scattering can produce a 21-cm power spectrum signal with
acoustic oscillations. The signal can be up to three orders of magnitude larger
than expected in $Łambda$CDM cosmology, given realistic astrophysical models.
This model provides a new-physics target for near-future experiments such as
HERA or NenuFAR, which can potentially discover or strongly constrain the dark
matter explanation of the putative EDGES anomaly.
Description
Anticipating a New-Physics Signal in Upcoming 21-cm Power Spectrum Observations
%0 Generic
%1 barkana2022anticipating
%A Barkana, Rennan
%A Fialkov, Anastasia
%A Liu, Hongwan
%A Outmezguine, Nadav Joseph
%D 2022
%K library
%T Anticipating a New-Physics Signal in Upcoming 21-cm Power Spectrum
Observations
%U http://arxiv.org/abs/2212.08082
%X Dark matter-baryon interactions can cool the baryonic fluid, which has been
shown to modify the cosmological 21-cm global signal. We show that in a
two-component dark sector with an interacting millicharged component, dark
matter-baryon scattering can produce a 21-cm power spectrum signal with
acoustic oscillations. The signal can be up to three orders of magnitude larger
than expected in $Łambda$CDM cosmology, given realistic astrophysical models.
This model provides a new-physics target for near-future experiments such as
HERA or NenuFAR, which can potentially discover or strongly constrain the dark
matter explanation of the putative EDGES anomaly.
@misc{barkana2022anticipating,
abstract = {Dark matter-baryon interactions can cool the baryonic fluid, which has been
shown to modify the cosmological 21-cm global signal. We show that in a
two-component dark sector with an interacting millicharged component, dark
matter-baryon scattering can produce a 21-cm power spectrum signal with
acoustic oscillations. The signal can be up to three orders of magnitude larger
than expected in $\Lambda$CDM cosmology, given realistic astrophysical models.
This model provides a new-physics target for near-future experiments such as
HERA or NenuFAR, which can potentially discover or strongly constrain the dark
matter explanation of the putative EDGES anomaly.},
added-at = {2022-12-19T09:32:33.000+0100},
author = {Barkana, Rennan and Fialkov, Anastasia and Liu, Hongwan and Outmezguine, Nadav Joseph},
biburl = {https://www.bibsonomy.org/bibtex/22d431200835215280ac8160024d3e21a/gpkulkarni},
description = {Anticipating a New-Physics Signal in Upcoming 21-cm Power Spectrum Observations},
interhash = {286f89f0b9ef285126368b9eba3788f2},
intrahash = {2d431200835215280ac8160024d3e21a},
keywords = {library},
note = {cite arxiv:2212.08082Comment: 5 pages + appendices, 2 figures},
timestamp = {2022-12-19T09:32:33.000+0100},
title = {Anticipating a New-Physics Signal in Upcoming 21-cm Power Spectrum
Observations},
url = {http://arxiv.org/abs/2212.08082},
year = 2022
}