Probing the dark ages and cosmic dawn with 21cm global spectrum in the DSL mission

Key Points

• The study aims to explore the cosmic dark ages and dawn using the global 21cm spectrum from neutral hydrogen.
• Utilized lunar orbit for measurement of the 21cm global spectrum.
• Measured frequency bands of 0.1-30 MHz and 30-120 MHz.
• Addressed common systematic errors in ground-based experiments.
• Investigated physical processes affecting the 21cm spectrum shape in cosmological models.
• Identified the importance of the 21cm global spectrum for understanding cosmic evolution.
• Noted limited ability to distinguish cosmological models based solely on 21cm observations due to parameter degeneracy.
• Emphasized the need for complementary observational techniques for accurate insights into early cosmic history.