论文标题
仔细观察多余的无线电背景的深色光子解释
A closer look at dark photon explanations of the excess radio background
论文作者
论文摘要
观察到的过多的无线电背景一直是十多年的难题。最新的新物理解决方案涉及暗物质，在存在热暗光子背景的情况下，该暗物质会腐烂到深色光子。然后，产生的非热暗光子光谱在电离时代周围转换为标准光子，在频率范围内，产生了近似的幂律无线电过量，并带有亮度温度$ t（ν）\simeqν^{ - 2.5} $，$ n $ν$。即使需要几种成分使其正常运行，这种简单的幂律模型即使很接近当前数据。在本文中，我们研究了该模型的一些细节，展示了个人影响的重要性。特别是，与权力法的显着偏差存在于$ν\ Lessim 100 \，{\ rm MHz} $和$ν\ gtrsim 1 \，{\ rm ghz} $。与幂律频谱相比，这些效果会改善数据的拟合度，并且可能在未来的观察中进行测试。我们还重点介绍了可以通过未来CMB光谱失真实验（例如{\ it pixie}）进行测试的独立签名。
The observed excess radio background has remained a puzzle for over a decade. A recent new physics solution involves dark matter that decays into dark photons in the presence of a thermal dark photon background. The produced non-thermal dark photon spectrum then converts into standard photons around the reionization era, yielding an approximate power-law radio excess with brightness temperature $T(ν)\simeq ν^{-2.5}$ over a wide range of frequencies, $ν$. This simple power-law model comes intriguingly close to the current data, even if several ingredients are required to make it work. In this paper, we investigate some of the details of this model, showcasing the importance of individual effects. In particular, significant deviation from a power law are present at $ν\lesssim 100\,{\rm MHz}$ and $ν\gtrsim 1\,{\rm GHz}$. These effects result in improving the fit to data compared to a power-law spectrum, and may become testable in future observations. We also highlight independent signatures that can be tested with future CMB spectral distortion experiments such as {\it PIXIE}.
