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arXiv 2106.04588astro-ph.CO
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混合暗物质:物质功率谱和晕质量函数

Mixed dark matter: matter power spectrum and halo mass function

G. Parimbelli, G. Scelfo, S. K. Giri, A. Schneider, M. Archidiacono, S. Camera, M. Viel

摘要:

我们调查和量化混合(冷和暖)暗物质模型的大尺度结构观测的影响。在这种情况下,暗物质有两个阶段,一个是冷的阶段(CDM),一个是暖的阶段(WDM):后者的存在会导致物质功率谱的抑制,这是当前限制所允许的,可以在当前和即将到来的调查中检测到。我们运行了一个大的$N$体模拟,以建立一个有效的和准确的仿真器来预测上述抑制的百分比精度在很宽的范围内的WDM质量,$M_\mathrm{wdm}$,其分数相对于整体的暗物质,$f_\mathrm{wdm}$的值。对$k\lesssim 10 \ h/$ Mpc和$z\leq 3.5$,在2%的水平上,物质功率谱的抑制与宇宙学参数的变化无关.在相同的范围内,通过对$Λ$ CDM和CWDM模拟应用重子化程序来考虑反馈的影响,我们发现两种情况之间的协议类似的水平。我们研究的影响,这种抑制弱透镜和角星系集群功率谱。最后,我们讨论了混合暗物质的晕质量函数的形状和分析处方产生的最佳协议与模拟的影响。我们为读者提供了一个应用程序的星系团数计数。

英文摘要:

We investigate and quantify the impact of mixed (cold and warm) dark matter models on large-scale structure observables. In this scenario, dark matter comes in two phases, a cold one (CDM) and a warm one (WDM): the presence of the latter causes a suppression in the matter power spectrum which is allowed by current constraints and may be detected in present-day and upcoming surveys. We run a large set of $N$-body simulations in order to build an efficient and accurate emulator to predict the aforementioned suppression with percent precision over a wide range of values for the WDM mass, $M_\mathrm{wdm}$, and its fraction with respect to the totality of dark matter, $f_\mathrm{wdm}$. The suppression in the matter power spectrum is found to be independent of changes in the cosmological parameters at the 2% level for $k\lesssim 10 \ h/$Mpc and $z\leq 3.5$. In the same ranges, by applying a baryonification procedure on both $Λ$CDM and CWDM simulations to account for the effect of feedback, we find a similar level of agreement between the two scenarios. We examine the impact that such suppression has on weak lensing and angular galaxy clustering power spectra. Finally, we discuss the impact of mixed dark matter on the shape of the halo mass function and which analytical prescription yields the best agreement with simulations. We provide the reader with an application to galaxy cluster number counts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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