arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.11504astro-ph.COastro-ph.GAhep-ph
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镜像暗物质的约束星系结构

Constraining galactic structures of mirror dark matter

Jean-Samuel Roux, James M. Cline

摘要:

最简单的镜像扇区暗物质模型保持了精确的镜像对称性,但在镜像扇区中有一个重子丰度$Ω_{b'} = βΩ_b$和一个被抑制的温度$T' = x T$;因此它只依赖于两个参数,$β,x$。对于足够小的$x$,早期的宇宙学观测值可能不会限制镜像重子构成所有的暗物质,尽管它们有很强的自相互作用,这取决于隐藏扇区中结构形成的未知细节。在这里,我们通过模拟镜像结构的形成,利用宇宙学和天文学数据绘制出参数空间的允许区域来填补这个漏洞。我们发现,银河系盘的表面密度和隆起质量约束$Ω_{b'}\lesssim 0.3 Ω_{b}$在最高的$T'$允许的BBN和CMB($T'=0.5 T$),或$Ω_{b'}\lesssim 0.8 Ω_{b}$在较低的值$T'$。我们还简要地讨论了实现必要的温度之间的不对称性SM和镜部门在我们的模型与完整的镜像对称性。

英文摘要:

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.

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