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arXiv 2402.06235astro-ph.COgr-qchep-phhep-th
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宇宙弦环早期结构形成的N体模拟

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

Hao Jiao, Robert Brandenberger, Alexandre Refregier

AI总结:

本研究利用N体模拟,结合Zeldovich近似解析位移,发现宇宙弦环主导高红移晕质量函数,且总晕质量函数近似为宇宙弦与标准ΛCDM贡献之和。

摘要:

通过N体模拟,我们研究了在宇宙弦环的标度分布存在下的早期结构形成。宇宙弦环主导高红移晕质量函数,而标准结构形成情景所引发的涨落则主导低红移结构。在我们的研究中,宇宙弦环的影响通过在模拟初始时刻位移暗物质粒子及其速度来考虑,位移量由利用Zeldovich近似的解析分析确定。我们发现,所得的晕质量函数在很好的近似下等于解析确定的宇宙弦晕质量函数与标准ΛCDM模型所得晕质量函数之和。

英文摘要:

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 $Λ$CDM model.

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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