BibTeX

@article{2412.10310v1,
Author        = {Quentin Decant and Androniki Dimitriou and Laura Lopez Honorez and Bryan Zaldivar},
Title         = {Simulation-based inference on warm dark matter from HERA forecasts},
Eprint        = {2412.10310v1},
ArchivePrefix = {arXiv},
PrimaryClass  = {astro-ph.CO},
Abstract      = {The redshifted 21cm signal from Cosmic Dawn promises to open a new window
into the early history of our universe and enable the probing of an
unprecedented comoving survey volume. In this work, we revisit the imprint of
Warm Dark Matter (WDM) on the 21cm signal power spectrum using an updated
implementation of the WDM effect in the public code $\texttt{21cmFast}$ and
considering a single population of cosmic dawn galaxies. By focusing on
inferring the WDM mass, we analyze the degeneracies between the latter and the
astrophysics parameters characterizing star formation and X-ray heating and we
emphasize the role of the threshold mass for star-forming galaxies, $M_{\rm
turn}$. We study the capability of the recently built HERA telescope to
reconstruct the WDM mass by adopting the statistical approach of
simulation-based inference. We include a comparison of the per-parameter
reconstruction quality for different number of simulations used in the training
of the algorithm. Our results indicate that HERA could surpass current
Lyman-$\alpha$ forest constraints if Cosmic Dawn galaxies exhibit a threshold
mass $M_{\rm turn}\lesssim 10^{8}\, M_\odot$. The X-ray source properties
considered in this study may also influence the strength of the WDM constraint
for lower threshold masses.},
Year          = {2024},
Month         = {Dec},
Url           = {http://arxiv.org/abs/2412.10310v1},
File          = {2412.10310v1.pdf}
}