How Cloud-9 Observations Could Be Consistent with the Cold Hydogen Dark Matter (CHDM) Theory (a Brief Note)

Abstract

It is suggested that the CHDM theory can be seamlessly integrated into the ΛCDM model and cosmological timeline, including a likely explanation of Cosmic Dawn and “Cloud-9” observations. Confirmatory evidence necessary for acceptance of the CHDM theory may lie in further study of the Cloud-9 dark matter halo or the halo of another RELHIC gas cloud, as described herein. For example, the discovery of an unusually strong 21-cm absorption line within a quasar spectrum in the background of a RELHIC would provide strong evidentiary support for CHDM. Counterarguments to the CHDM theory which focus on “missing” hydrogen baryonic matter appear to be refuted by comparing the Posti & Helmi 20 kpc radius Milky Way halo dark matter mass (635 billion solar masses) to a high-end estimate of the deep space cold neutral hydrogen mass (827 billion solar masses) within the same halo.