Composite solution to the EDGES anomaly
Abstract
Subcomponent millicharged dark matter that cools baryons via Coulomb interactions has been invoked to explain the EDGES anomaly. However, this model is in severe tension with constraints from cosmology and stellar emissions. In this work, we consider the consequences of these millicharged particles existing in composite Qballs. The relevant degrees of freedom at high temperature are minuscule elementary charges, which fuse at low temperatures to make up Qballs of larger charge. These Qballs serve as the degrees of freedom relevant in cooling the baryons sufficiently to account for the EDGES anomaly. In such a model, cosmology and stellar constraints (which involve hightemperature processes) apply only to the feebly interacting elementary charges and not to the Qballs. This salvages a large range of parameter space for millicharged Qballs that can explain the EDGES anomaly. It also opens up new parameter space for direct detection, albeit at low momentum transfers.
 Publication:

Physical Review D
 Pub Date:
 April 2022
 DOI:
 10.1103/PhysRevD.105.075020
 arXiv:
 arXiv:2102.11284
 Bibcode:
 2022PhRvD.105g5020M
 Keywords:

 High Energy Physics  Phenomenology;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 8 pages, 3 figures