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We revisit the global 21cm signal calculation incorporating a possible radiobackground at early times, and find that the global 21cm signal shows a muchstronger absorption feature, which could enhance detection prospects for future21 cm experiments. In light of recent reports of a possible low-frequencyexcess radio background, we propose that detailed 21 cm calculations shouldinclude a possible early radio background.

Enhanced global signal of neutral hydrogen due to excess radiation at cosmic dawn