超轻暗光子暗物质产生的亚兆赫兹射电背景
Sub-MHz Radio Background from Ultralight Dark Photon Dark Matter
AI总结：
本文提出通过超轻暗光子与宇宙线轻子的暗逆康普顿散射产生亚兆赫兹背景辐射，并结合银河系射电观测对超轻暗光子暗物质的动力学混合给出领先限制。
摘要：
暗光子是暗物质的一个具有良好理论动机的候选者，但对于超轻质量，利用实验和天体物理探针进行探测都变得困难。在这项工作中，我们提出一种新方法来探索这一质量区间，即通过超轻暗光子与宇宙线电子和正电子之间的暗逆康普顿散射。我们表明，这一过程会产生一种潜在可观测的背景辐射，且在低于 MHz 的频率上最为显著。我们利用最新的宇宙线模型和射电吸收图计算了这一效应。将其与来自 Explorer 43、Radio Astronomy Explorer 2 和 Parker Solar Probe 的银河系射电谱观测结果进行比较后，我们对质量 $\lesssim 2 \times 10^{-17} \\ \rm eV$ 的暗光子暗物质的动力学混合给出了领先的限制。
英文摘要：
Dark photons are a well-motivated candidate for dark matter, but their detection becomes challenging for ultralight masses with both experimental and astrophysical probes. In this work, we propose a new approach to explore this regime through the dark inverse Compton scattering of ultralight dark photons with cosmic ray electrons and positrons. We show this process generates a potentially observable background radiation that is most prominent at frequencies below MHz. We compute this effect using the latest cosmic ray models and radio absorption maps. Comparing it to observations of the Milky Way's radio spectrum from Explorer 43, Radio Astronomy Explorer 2, and the Parker Solar Probe, we place leading constraints on the kinetic mixing of dark photon dark matter for masses $\lesssim 2 \times 10^{-17} \ \rm eV$.
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