Electromagnetic waves propagating in the string axiverse
Electromagnetic waves propagating in the string axiverse
复制标题
电磁波在弦轴宇宙中传播
DOI：
10.1093/ptep/pty029
复制
发表时间：
2018
影响因子：
3.5
通讯作者：
Soda Jiro
中科院分区：
文献类型：
--
作者：
Yoshida Daiske ;Soda Jiro
人们普遍认为，轴子在弦理论中无处不在，可能是暗物质。轴子暗物质的特殊特征是相干振荡和通过陈-西蒙斯项与电磁场耦合。在这封信中，我们研究的后果，这两个功能的轴子与质量范围。首先，我们研究了由轴子相干振荡引起的电磁波的参量共振。由于共振频率是由轴子暗物质的质量决定的，如果我们探测到这个信号，就可以得到轴子暗物质质量的信息。其次，我们研究了轴子暗物质背景下的光速。在陈-西蒙斯项的存在下，色散关系被修改，光速将随时间振荡。事实证明，光速的变化很难观察到。我们认为，未来的无线电波观测的共振可以引起一个更强的约束的耦合常数和/或密度的轴子暗物质。
It is widely believed that axions are ubiquitous in string theory and could be dark matter. The peculiar features of axion dark matter are coherent oscillations and a coupling to the electromagnetic field through the Chern–Simons term. In this letter, we study the consequences of these two features of axions with mass in the rangeto. First, we study the parametric resonance of electromagnetic waves induced by the coherent oscillation of the axion. Since the resonance frequency is determined by the mass of the axion dark matter, if we detect this signal, we can get information on the mass of the axion dark matter. Second, we study the velocity of light in the background of the axion dark matter. In the presence of the Chern–Simons term, the dispersion relation is modified and the speed of light will oscillate in time. It turns out that the change in the speed of light would be difficult to observe. We argue that future radio wave observations of the resonance can give rise to a stronger constraint on the coupling constant and/or the density of the axion dark matter.