论文标题
探索低红移观察的自我相互作用的暗物质属性
Exploring the Self Interacting Dark Matter Properties From Low Redshift Observations
论文作者
论文摘要
小规模的观察表明，暗物质可能是自我互动。在本文中，我们在动力学理论形式主义中计算了自相互作用暗物质（SIDM）流体的剪切（$η$）和散装粘度（$ζ$）。此外，使用$η/\ mathfrak {s} $绑定的KSS，我们得出了暗物质自动交互横截面与其质量$σ/m $的新上限。然后，使用$σ/m $约束，我们表明KSS绑定仅允许SIDM粒子的子GEV质量。此外，通过假设$η$和$ζ$的幂律形式，我们根据低红移观察结果研究了其演变。我们发现，在较大的红移下，SIDM粘度很小，但是在小红移下，它变得足够大，并且在宇宙散发中造成了显着贡献。结果，粘性Sidm可以解释低红移的观测值，并且与标准宇宙学预测一致。
The small scale observations indicate that the dark matter may be self-interacting. In this paper, we calculate the shear ($η$) and bulk viscosity ($ζ$) of Self Interacting Dark Matter (SIDM) fluid, in kinetic theory formalism. Further, using the KSS bound on $η/\mathfrak{s}$, we derive a new upper limit on the ratio of dark matter self interaction cross section to its mass, $ σ/m $. Then, using the $ σ/m $ constraint, we show that KSS bound allows only sub-GeV mass of SIDM particle. Further, with the assumption of a power-law form of $η$ and $ζ$, we study its evolution in the light of low redshift observations. We find that at the large redshift, the SIDM viscosity is small but at the small redshift it becomes sufficiently large and contributes significantly in cosmic dissipation. As a consequence, viscous SIDM can explain the low redshift observations and also consistent with the standard cosmological prediction.
