Probing axion dark matter with 21cm fluctuations from minihalos
Probing axion dark matter with 21cm fluctuations from minihalos
复制标题
利用迷你光晕 21 厘米波动探测轴子暗物质
DOI：
10.1103/physrevd.103.023521
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发表时间：
2021
影响因子：
5
通讯作者：
Tashiro Hiroyuki
中科院分区：
文献类型：
--
作者：
Kadota Kenji;Sekiguchi Toyokazu;Tashiro Hiroyuki
如果对称性破缺诱导轴子发生在膨胀后，大的轴子等曲率扰动可能会出现由于不同的轴子振幅在每个因果断开补丁。这导致了小尺度密度涨落的增强，从而显著影响了结构形成的演化。小晕形成的时代变早，我们估计这些小晕的丰度，可以托管中性氢原子，导致21厘米的波动信号。我们发现，未来的射电望远镜，如平方公里阵列，可以把简单的温度无关的轴子质量模型的轴子质量界的订单，和边界可以扩展到一个温度依赖的轴子质量的订单。
If the symmetry breaking inducing the axion occurs after the inflation, the large axion isocurvature perturbations can arise due to a different axion amplitude in each causally disconnected patch. This causes the enhancement of the small-scale density fluctuations which can significantly affect the evolution of structure formation. The epoch of the small halo formation becomes earlier and we estimate the abundance of those minihalos which can host the neutral hydrogen atoms to result in the 21 cm fluctuation signals. We find that the future radio telescopes, such as the Square Kilometer Array, can put the axion mass bound of orderfor the simple temperature-independent axion mass model, and the bound can be extended to of orderfor a temperature-dependent axion mass.