Altered axion abundance from a dynamical Peccei-Quinn scale
Altered axion abundance from a dynamical Peccei-Quinn scale
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DOI：
10.1103/physrevd.105.123517
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发表时间：
2022-03
影响因子：
5
通讯作者：
I. Allali;M. Hertzberg;Y. Lyu
中科院分区：
文献类型：
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作者：
I. Allali;M. Hertzberg;Y. Lyu
我们建立了一个模型，在该模型中，由于存在一个新的光标量耦合到Peccei-Quinn（PQ）场的径向部分，轴子的遗迹丰度从标准的未对准机制中改变，无论是增加还是减少。光标量使有效的PQ破缺标度成为动力学的，改变了轴子的早期动力学，并减少了其晚期暗物质的丰度。我们分析了这种新的机制半解析和数值，表明我们可以容纳更轻或更重的轴子暗物质相比，标准的治疗。我们讨论了轴子搜索和基础物理模型的影响。
We build a model in which the relic abundance of axions is altered from the standard misalignment mechanism, either increased or decreased, due to the presence of a new light scalar that couples to the radial part of the Peccei-Quinn (PQ) field. The light scalar makes the effective PQ symmetry-breaking scale dynamical, altering the early-time dynamics for the axion and affecting its late-time dark matter abundance. We analyze this new mechanism semianalytically and numerically, showing that we can accommodate both lighter or heavier axion dark matter, compared to the standard treatments. We discuss implications of the model for axion searches and fundamental physics.