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arXiv 1608.02575astro-ph.COastro-ph.GAgr-qchep-ph
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模糊暗物质晕的子结构

Substructure of fuzzy dark matter haloes

Xiaolong Du, Christoph Behrens, Jens C. Niemeyer

摘要:

通过求解与质量相关的势垒函数的偏移集问题,导出了模糊暗物质的晕质量函数。我们发现,与Sheth-Tormen HMF的FDM方法相比,我们的方法具有更高的截止质量,并且截止质量随红移的变化不太强烈。使用合并树构造与修改后的版本的莱西和科尔形式主义,占抑制小尺度功率和FDM晕的尺度依赖性的增长和半解析GALACTICUS代码,我们研究了统计的晕子结构,包括从动态摩擦和潮汐剥离的影响。我们发现,如果暗物质是冷暗物质(CDM)和FDM的混合物,则在小尺度上会对晕子结构产生抑制,这可能能够解决纯CDM模型所面临的缺星问题。随着FDM分数的增加或FDM质量的减少,抑制变得更强。因此,它可以用于约束FDM模型。

英文摘要:

We derive the halo mass function (HMF) for fuzzy dark matter (FDM) by solving the excursion set problem explicitly with a mass-dependent barrier function, which has not been done before. We find that compared to the naive approach of the Sheth--Tormen HMF for FDM, our approach has a higher cut off mass and the cut off mass changes less strongly with redshifts. Using merger trees constructed with a modified version of the Lacey & Cole formalism that accounts for suppressed small scale power and the scale-dependent growth of FDM haloes and the semi-analytic GALACTICUS code, we study the statistics of halo substructure including the effects from dynamical friction and tidal stripping. We find that if the dark matter is a mixture of cold dark matter (CDM) and FDM, there will be a suppression on the halo substructure on small scales which may be able to solve the Missing Satellites Problem faced by the pure CDM model. The suppression becomes stronger with increasing FDM fraction or decreasing FDM mass. Thus, it may be used to constrain the FDM model.

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