论文标题
用CMB数据限制深色光子及其连接到21 cm宇宙学
Constraining dark photons and their connection to 21 cm cosmology with CMB data
论文作者
论文摘要
在不均匀的宇宙中，黑暗光子向普通光子（反之亦然）的宇宙学转换可能发生在许多共振红移中。这改变了CMB观察到的能量光谱和小型各向异性的程度。我们利用Eagle仿真的结果来获得沿随机线的转换概率来量化这些效果。然后，我们将结果应用于暗物质衰减以及它们的高红移转换为普通光子的情况下，可以修改宇宙黎明时代预期的全局21 cm信号。具体而言，我们表明，参数空间的很大一部分是CMB雷利 - 吉恩斯尾部转换的光子种群的解释，它解释了边缘观察到的吸收强度，这是根据COBE/FIRA的亮度温度测量和CMB和SPT的CMB各向异性测量结果所排除的。
In the inhomogeneous Universe, the cosmological conversion of dark photons into ordinary photons (and vice versa) may happen at a great number of resonance redshifts. This alters the CMB observed energy spectrum and degree of small-scale anisotropies. We utilize results from the EAGLE simulation to obtain the conversion probability along random line-of-sights to quantify these effects. We then apply our results to the case where dark photons are sourced by dark matter decay and their high-redshift conversion into ordinary photons modify the global 21 cm signal expected from the cosmic dawn era. Concretely, we show that a significant portion of the parameter space for which a converted population of photons in the Rayleigh-Jeans tail of the CMB explains the absorption strength observed by EDGES, is ruled out from the brightness temperature measurements of COBE/FIRAS and the CMB anisotropy measurements of Planck and SPT.
