论文标题
通过21厘米森林探测超光轴向颗粒
Probing Oscillons of Ultra-Light Axion-like Particle by 21cm Forest
论文作者
论文摘要
超光轴状颗粒（ULAP）是针对天体物理学中小尺度问题的解决方案之一。当这样的标量粒子用$ \ MATHCAL {O}（1）$振幅在潜在的较浅的情况下振荡时，它可以形成局部密集的对象Oscillon。由于它的长寿是由于绝热不变的大致保存，因此它可以生存到最近的宇宙中，以红移$ z \ sim \ sim \ Mathcal {o}（10）$。受这些oscillons影响的量表由ULAP质量$ M $确定，可通过21厘米线的观测来检测。在本文中，我们研究了通过21厘米线检测到ULAP的可能性，发现Oscillon可以增强21厘米线观测的信号，当$ M \ M \ Lessim 10^{ - 19} \ {\ rm ev} $，以及对暗物质的ULAP效果的范围大于$ 10^{ - 2^{-2} $依赖于$ 10^{ - 2} $。
Ultra-Light Axion-like Particle (ULAP) is motivated as one of the solutions to the small scale problems in astrophysics. When such a scalar particle oscillates with an $\mathcal{O}(1)$ amplitude in a potential shallower than quadratic, it can form a localized dense object, oscillon. Because of its longevity due to the approximate conservation of the adiabatic invariant, it can survive up to the recent universe as redshift $z \sim \mathcal{O}(10)$. The scale affected by these oscillons is determined by the ULAP mass $m$ and detectable by observations of 21cm line. In this paper, we examine the possibility to detect ULAP by 21cm line and find that the oscillon can enhance the signals of 21cm line observations when $m \lesssim 10^{-19}\ {\rm eV}$ and the fraction of ULAP to dark matter is much larger than $10^{-2}$ depending on the form of the potential.
