论文标题
用Minihalos的21厘米波动探测轴线暗物质
Probing axion dark matter with 21cm fluctuations from minihalos
论文作者
论文摘要
如果对称性破裂引起通货膨胀后发生的轴，则由于每个因果关系隔离的斑块中的轴振幅不同，可能会出现较大的轴突等效性扰动。这会导致小规模密度波动的增强，这可能会显着影响结构形成的演变。小晕圈形成的时期较早，我们估计那些可以容纳中性氢原子的Minihalos的丰度，从而导致21厘米的波动信号。我们发现，对于简单的独立温度独立的轴支质量模型，将来的射电望远镜（例如SKA）可以将轴上质量限制为$ m_a \ gtrsim 10^{ - 13} $ eV，并且可以将限制扩展到$ $ m_a \ m_a \ gtrsim 10^{ - 8} $ ev for温度依赖于温度依赖温度依赖温度的轴。
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 21cm fluctuation signals. We find that the future radio telescopes, such as the SKA, can put the axion mass bound of order $m_a \gtrsim 10^{-13}$ eV for the simple temperature-independent axion mass model, and the bound can be extended to of order $m_a \gtrsim 10^{-8}$eV for a temperature-dependent axion mass.
