论文标题
暗物质 - 巴里昂相对速度对21厘米森林的影响
Impact of dark matter-baryon relative velocity on the 21cm forest
论文作者
论文摘要
我们研究暗物质（DM）和巴里昂（Baryon）对21厘米森林信号的相对速度的影响。 DM - 巴里昂相对速度是由于在Baryon-Photon脱钩时期之前的不同演变而产生的，并且给出了额外的各向异性压力，可以抑制扰动的生长。令人着迷的是，尺度$ k \ sim {\ cal o}（10 \ sim 10^3）h/\ mathrm {mpc} $，其中物质功率谱部受到这样的流速度的影响，事实证明，这是21cm森林信号对此的比例。我们证明，由于由DM-Baryon相对速度引起的小规模物质功率谱抑制，21cm吸收线的丰度可以降低少数因素。
We study the effect of the relative velocity between the dark matter (DM) and the baryon on the 21cm forest signals. The DM-baryon relative velocity arises due to their different evolutions before the baryon-photon decoupling epoch and it gives an additional anisotropic pressure that can suppress the perturbation growth. It is intriguing that the scales $k\sim {\cal O}(10\sim 10^3)h/\mathrm{Mpc}$ at which the matter power spectrum is affected by such a streaming velocity turns out to be the scale at which the 21cm forest signal is sensitive to. We demonstrate that the 21cm absorption line abundance can decrease by more than a factor of a few due to the small-scale matter power spectrum suppression caused by the DM-baryon relative velocity.
