Investigating the nature of dark matter and early-universe black hole formation based on the Hongmeng measurement of the global 21-cm spectrum

Key Points

• The aim is to explore dark matter physics and black hole formation mechanisms using the global 21-cm spectrum data.
• Analyzed the global 21-cm spectrum from the Hongmeng project to study dark matter and black holes.
• Classified various dark matter candidates based on their effects on the 21-cm spectrum.
• Considered the interactions and characteristics of black holes in relation to cosmic structure formation.
• The Hongmeng project's measurements could constrain particle mass and scattering parameters of ultralight dark matter.
• Potential limitations on primordial black hole abundance through detecting Hawking radiation.
• Possible restrictions on the properties of high-redshift direct collapse black holes.