In previous works, we discussed the 21-cm signature of a single cosmic string wake. However, the 21-cm brightness temperature is influenced by a network of cosmic string wakes, and not one single wake. In this work, we consider the signal from a network of wakes laid down during the matter era. We also improve on the previous calculation of a single wake signature. Finally, we calculate the enhancement of the global 21-cm brightness temperature due to a network of wakes and discuss its affects of the signal measured in the Wouthuysen–Field absorption trough. We estimated that for string tensions between 10−8 and 10−7 there would be between a 10 per cent and a factor of 2 enhancement in the signal.

中文翻译：

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宇宙弦网络的全球 21 厘米信号唤醒

在之前的作品中，我们讨论了单个宇宙弦尾迹的 21 厘米特征。然而，21 厘米的亮度温度受到宇宙弦尾迹网络的影响，而不是单个尾迹。在这项工作中，我们考虑了物质时代建立的唤醒网络的信号。我们还改进了之前对单个唤醒签名的计算。最后，我们计算了由于尾流网络导致的全球 21 厘米亮温的增强，并讨论了它对在 Wouthuysen-Field 吸收槽中测量的信号的影响。我们估计，对于 10-8 和 10-7 之间的弦张力，信号的增强会在 10% 到 2 倍之间。