Dark photon dark matter produced by axion oscillations
Dark photon dark matter produced by axion oscillations
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DOI：
10.1103/physrevd.99.075002
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发表时间：
2018-10
影响因子：
5
通讯作者：
R. Co;A. Pierce;Zhengkang Zhang;Yue Zhao
中科院分区：
文献类型：
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作者：
R. Co;A. Pierce;Zhengkang Zhang;Yue Zhao
尽管人们对以假设的暗光子形式寻找超轻暗物质的兴趣越来越大，并付出了大量努力，但它如何符合一致的宇宙学尚不清楚。已知先前提出的几种暗光子暗物质产生机制具有局限性，至少在某些实验感兴趣的质量范围内。在本文中，我们探索了一种新的机制，相干振荡类轴子场可以有效地转移其能量密度的暗光子场通过快子不稳定性。剩余的轴子遗迹随后通过与可见扇区的耦合而耗尽，只留下暗光子作为暗物质。我们保证了轴子和暗光子的宇宙学与现有的约束条件是一致的。我们发现，该机制适用于广泛的暗光子质量，包括正在进行的实验和拟议的检测技术的兴趣。
Despite growing interest and extensive effort to search for ultralight dark matter in the form of a hypothetical dark photon, how it fits into a consistent cosmology is unclear. Several dark photon dark matter production mechanisms proposed previously are known to have limitations, at least in certain mass regimes of experimental interest. In this paper, we explore a novel mechanism, where a coherently oscillating axionlike field can efficiently transfer its energy density to a dark photon field via a tachyonic instability. The residual axion relic is subsequently depleted via couplings to the visible sector, leaving only the dark photon as dark matter. We ensure that the cosmologies of both the axion and dark photon are consistent with existing constraints. We find that the mechanism works for a broad range of dark photon masses, including those of interest for ongoing experiments and proposed detection techniques.