论文标题
使用银河中央质量的观察限制，对超光标度场暗物质的质量和自耦合的限制
Constraints on the mass and self-coupling of Ultra-Light Scalar Field Dark Matter using observational limits on galactic central mass
论文作者
论文摘要
众所周知，超光的暗物质（ULDM），通常是质量$ M \ sim 10^{ - 22}〜{\ rm eV} $的标量字段，可以解决冷暗物质（CDM）范式的一些杰出问题。这样的标量字段可能具有不可忽略的自耦合$λ$。在这项工作中，使用星系中心浓缩暗物质量的已知观察性上限，我们在$λ-m $（自耦合$ - $ - $ - $质量）参数空间中获得了观察性约束。发现对ULDM的质量$ m $的观察限制取决于自我相互作用的符号和强度。我们证明，对于$ m \ sim 10^{ - 22}〜{\ rm ev} $，$ {\ cal o}的自耦合值（10^{ - 96}）$（对应于$ a_s \ sim \ sim \ sim 10^{ - 82}}^{\ rm m m} $ 7的散射长度，可以在10^{\ rm m m} $上列入限制。 星系。我们的分析表明，如果Ultra Light Axions（ULAS）形成所有暗物质，则其质量必须小于$ \ sim 6 \ times 10^{ - 23} $ ev。
It is well known that Ultra-Light Dark Matter (ULDM), usually scalar fields of mass $m \sim 10^{-22}~{\rm eV}$, can solve some of the outstanding problems of the Cold Dark Matter (CDM) paradigm. Such a scalar field could have non-negligible self-coupling $λ$. In this work, using the known observational upper limit on the amount of centrally concentrated dark matter in a galaxy, we arrive at the observational constraints in the $λ- m$ (self coupling $-$ mass) parameter space. It is found that the observational limit on the mass $m$ of the ULDM depends upon the sign and strength of the self-interactions. We demonstrate that, for $m \sim 10^{-22}~{\rm eV}$, self-coupling values of ${\cal O}(10^{-96})$ (corresponding to a scattering length of $a_s \sim 10^{-82}~{\rm m}$) can be probed using limits on the dark matter mass within 10 pc of the centre of M87 galaxy. Our analysis suggests that if Ultra Light Axions (ULAs) form all of dark matter, its mass has to be less than $\sim 6 \times 10^{-23}$ eV.
