Gravitational wave forest from string axiverse
Gravitational wave forest from string axiverse
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DOI：
10.1088/1475-7516/2018/10/008
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发表时间：
2018-07
影响因子：
6.4
通讯作者：
N. Kitajima;J. Soda;Y. Urakawa
中科院分区：
文献类型：
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作者：
N. Kitajima;J. Soda;Y. Urakawa
弦论中预测的轴子可能有一个标量势，它的势区比传统的余弦势浅得多。我们首先表明，位于这样的浅电位区域的轴子一般经历突出的共振不稳定性：众所周知的窄共振和/或拍打共振，这还没有得到很好的研究。我们还研究了基于晶格模拟的这些共振不稳定性引起的轴子的非线性动力学。我们发现，弦轴子在不同的质量范围内产生的引力波（GW）的峰值在不同的频率确定的质量尺度，被称为GW森林。这可能使我们能够通过未来的多频GW观测来探索弦轴向。我们还研究了解释暗物质成分的轴子产生的引力波。
Axions predicted in string theory may have a scalar potential which has a much shallower potential region than the conventional cosine potential. We first show that axions which were located at such shallow potential regions generically undergo prominent resonance instabilities: the well-known narrow resonance and/or the flapping resonance, which has not been well investigated. We also study non-linear dynamics of axions caused by these resonance instabilities based on lattice simulation. We find that string axions in various mass ranges generate gravitational waves (GWs) with peaks at various frequencies determined by the mass scales, dubbed the GW forest. This may allow us to explore string axiverse through future multi-frequency GW observations. We also investigate GWs produced by the axion which accounts for present dark matter component.