In this short review I present the status of the global 21-cm signal detected by EDGES in March 2018. It is organized in three parts. First, I present the EDGES experiment and the fitting procedure used by the collaboration to extract the tiny 21-cm signal from large foregrounds of galactic synchrotron emission. Then, I review the physics behind the global 21-cm signature and I explain why the measured absorption feature is anomalous with respect to the predictions from standard astrophysics. I conclude with the implications for Beyond Standard Model (BSM) physics coming from the EDGES discovery.
Cite
@article{arxiv.1907.13384,
title = {21-cm line Anomaly: A brief Status},
author = {Paolo Panci},
journal= {arXiv preprint arXiv:1907.13384},
year = {2019}
}
Comments
8 pages, 1 figure. v2: few typos corrected; contribution to "La Thuile 2019, Les Rencontres de Physique de la Vall\'ee d'Aoste" (conference number: C19-03-10)