论文标题
约束镜面暗物质的银河结构
Constraining galactic structures of mirror dark matter
论文作者
论文摘要
镜像暗物质的最简单模型保持精确的镜像对称性，但具有Baryon丰度$ω__{b'} =βΩ_b$和抑制温度$ t $ t'= x t $在镜像扇区中；因此，它仅取决于两个参数，$β，x $。对于足够小的$ x $，早期的宇宙学可观察物可能不会限制镜子巴元，尽管它们的自我互动很强，但根据隐藏扇区中结构形成的未知细节，尽管它们的自我互动很强。在这里，我们通过模拟镜像结构形成，使用宇宙学和天文数据来绘制允许的参数空间区域。我们发现，银河系磁盘的表面密度和凸起的质量约束$ω______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________$ n of。我们还简要讨论了使用不间断的镜子对称性在模型中SM和镜像部门之间必要温度不对称的实现。
The simplest model of mirror sector dark matter maintains exact mirror symmetry, but has a baryon abundance $Ω_{b'} = βΩ_b$ and a suppressed temperature $T' = x T$ in the mirror sector; hence it depends only on two parameters, $β,x$. For sufficiently small $x$, early cosmological observables may not constrain mirror baryons from constituting all of the dark matter despite their strong self-interactions, depending on the unknown details of structure formation in the hidden sector. Here we close this loophole by simulating mirror structure formation, mapping out the allowed regions of parameter space using cosmological and astronomical data. We find that the Milky Way disk surface density and bulge mass constrain $Ω_{b'}\lesssim 0.3 Ω_{b}$ at the highest $T'$ allowed by BBN and CMB ($T'=0.5 T$), or $Ω_{b'}\lesssim 0.8 Ω_{b}$ at lower values of $T'$. We also briefly discuss the realization of the necessary temperature asymmetry between the SM and the mirror sector in our model with unbroken mirror symmetry.
