标题： 早期结构形成中宇宙弦环的N体模拟 显示英文标题

标题： N-Body Simulation of Early Structure Formation from Cosmic String Loops

摘要： 通过N体模拟，我们研究了存在尺度分布宇宙弦环时早期结构的形成。 宇宙弦环主导高红移晕质量函数，而由标准结构形成情景引发的涨落则主导低红shift的结构。 在我们的研究中，宇宙弦环的影响是通过在模拟初始时刻对暗物质粒子及其速度进行位移来考虑的，位移量由利用Zeldovich近似进行的解析分析确定。 我们发现，所得的晕质量函数大致由解析确定的宇宙弦晕质量函数和从标准$\Lambda$CDM模型得到的晕质量函数之和给出。 显示英文摘要

摘要： By means of N-body simulations, we study early structure formation in the presence of a scaling distribution of cosmic string loops. Cosmic string loops dominate the high redshift halo mass function while the fluctuations seeded by the standard structure formation scenario dominate structure at low redshifts. In our study, the effects of the cosmic string loops are taken into account by displacing the dark matter particles and their velocities at the initial time of the simulation by amounts determined by the analytical analysis which makes use of the Zeldovich approximation. We find that the resulting halo mass function is to a good approximation given by the sum of the analytically determined cosmic string halo mass function and the halo mass function obtained from the standard $\Lambda$CDM model.