用标量相互作用的暗物质促进等级结构的形成
Boosting hierarchical structure formation with scalar-interacting dark matter
摘要：
我们研究了宇宙结构形成的暗物质（DM）模型中长程标量相互作用的影响，特别关注晕的形成时间。利用$N$ -体模拟与$512^3$ DM粒子，我们表明，在我们的模型暗物质晕的形式大大提前：跟踪物体的红移$z\sim6$，我们发现，形成的时间，其特征在于红移$z_{1/2}$的光环已组装其最终质量的一半，逐渐从$z_{1/2}\approx 1.83$在基准LCDM模型的$z_{1/2}\approx 2.54$在最极端的自相互作用模型。这是伴随着红移的转变，标志着合并和稳定的吸积时代之间的过渡，从$z_{*}\approx 4.32$在\lcdm晕到$z_{*}\approx 6.39$在我们的最强相互作用模型。换句话说，在这项工作中采用的标量相互作用模型产生更多的结构在高红移，在同一时间延长了稳定的吸积阶段。这些效应结合在一起可以帮助LCDM模型解释WMAP数据所示的高红移再电离，并可以缓解与薄盘主导星系在低红移下的生存相关的问题。
英文摘要：
We investigate the effect of long-range scalar interactions in dark matter (DM) models of cosmic structure formation with a particular focus on the formation times of haloes. Utilising $N$-body simulations with $512^3$ DM particles we show that in our models dark matter haloes form substantially earlier: tracing objects up to redshift $z\sim6$ we find that the formation time, as characterised by the redshift $z_{1/2}$ at which the halo has assembled half of its final mass, is gradually shifted from $z_{1/2}\approx 1.83$ in the fiducial LCDM model to $z_{1/2}\approx 2.54$ in the most extreme self-interaction model. This is accompanied by a shift of the redshift that marks the transition between merger and steady accretion epochs from $z_{*}\approx 4.32$ in the \lcdm\ halos to $z_{*}\approx 6.39$ in our strongest interaction model. In other words, the scalar-interacting model employed in this work produces more structures at high redshifts, prolonging at the same time the steady accretion phases. These effects taken together can help the LCDM model to account for a high redshift reionisation as indicated by the WMAP data and can alleviate issues related to the survival of the thin-disk dominated galaxies at low redshifts.
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。
