Enhanced Global Signal of Neutral Hydrogen Due to Excess Radiation at Cosmic Dawn
Enhanced Global Signal of Neutral Hydrogen Due to Excess Radiation at Cosmic Dawn
We revisit the global 21cm signal calculation incorporating a possible radio background at early times, and find that the global 21cm signal shows a much stronger absorption feature, which could enhance detection prospects for future 21 cm experiments. In light of recent reports of a possible low-frequency excess radio background, …