论文标题
在我们的不均匀宇宙中建模深色光子振荡
Modeling Dark Photon Oscillations in Our Inhomogeneous Universe
论文作者
论文摘要
深色光子可能会与标准模型光子运动混合，从而导致可观察到的宇宙学特征。当深色光子质量与原始等离子体频率匹配时，混合会增强，这敏感地取决于电子的潜在空间分布。至关重要的是，此分布中的不均匀性可能会对共振转化的性质产生重大影响。我们首次开发并描述了一种普遍的分析形式主义，可以在存在不均匀性的情况下治疗共振振荡。我们的形式主义源于随机场的水平穿越理论，仅需要了解基础电子密度波动的单点概率分布函数（PDF）。我们使用模拟来验证形式主义，并说明了用于表征低红移宇宙的几种不同选择的PDARK光子转换概率。
A dark photon may kinetically mix with the Standard Model photon, leading to observable cosmological signatures. The mixing is resonantly enhanced when the dark photon mass matches the primordial plasma frequency, which depends sensitively on the underlying spatial distribution of electrons. Crucially, inhomogeneities in this distribution can have a significant impact on the nature of resonant conversions. We develop and describe, for the first time, a general analytic formalism to treat resonant oscillations in the presence of inhomogeneities. Our formalism follows from the theory of level crossings of random fields and only requires knowledge of the one-point probability distribution function (PDF) of the underlying electron number density fluctuations. We validate our formalism using simulations and illustrate the photon-to-dark photon conversion probability for several different choices of PDFs that are used to characterize the low-redshift Universe.
