遗迹中微子衰变：解决射电背景过剩的一种方案
Relic neutrino decay: a solution to the excess radio background
AI总结：
针对 ARCADE 2 射电背景过剩缺乏天体物理解释的问题，提出遗迹中微子辐射衰变为惰性中微子的方案，能很好拟合数据并预测更强的 21 cm 吸收信号，但与 EDGES 结果存在轻微张力。
摘要：
ARCADE 2 探测到的射电背景过剩表明存在新物理，因为没有明确的天体物理学解决方案。我们发现，假设为准简并的遗迹中微子辐射衰变为惰性中微子，能很好地拟合 ARCADE 2 数据。该方案还预测存在比 $Λ$CDM 模型预测更强的 21 cm 吸收全局信号，并具有对比亮温度。所得方案与 EDGES 合作组声称的更强信号存在轻微张力。
英文摘要：
The detection of excess radio background detected by ARCADE 2 suggests the presence of new physics as there exists no clear astrophysical solution. We find that the radiative decay of a relic neutrino into a sterile neutrino, assumed to be quasi-degenerate, provides a very good fit to ARCADE 2 data. The solution also predicts a stronger 21 cm absorption global signal than the predicted one from the $Λ$CDM model, with a contrast brightness temperature. The solution obtained is in mild tension with a much stronger signal claimed by the EDGES collaboration.
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