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

**Authors:** Chang Feng, Gilbert Holder  
**arXiv:** [1802.07432](https://arxiv.org/abs/1802.07432)  
**Date:** 2018-02-21  
**Summary page:** https://www.summarizepaper.com/en/paper/1802.07432v1/

## Abstract

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, we propose that detailed 21 cm calculations should include a possible early radio background.