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arXiv 1901.10690astro-ph.CO
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大质量中微子和动力学暗能量对团簇质量函数的影响

Effects of Massive Neutrinos and Dynamical Dark Energy on the Cluster Mass Function

Rahul Biswas, Katrin Heitmann, Salman Habib, Amol Upadhye, Adrian Pope, Nicholas Frontiere

摘要:

大质量中微子的存在会影响宇宙中大尺度结构的生长,在大质量暗物质主导的晕的丰度和性质上留下潜在的可观测印记。宇宙学巡天探测到大量以丰富的团和簇形式存在的这些晕,利用这些信息作为约束暗能量属性的输入。我们使用一套N体模拟,包括大质量中微子的影响,以及动态暗能量的质量函数的性质进行研究。在我们以前的工作中,我们遵循的方法有效的中微子质量低,假设中微子过密度太小,作为一个重要的非线性源项的重力。我们研究如何以及一个通用的形式的晕质量函数描述我们的数值结果,发现使用适当的线性功率谱内的形式主义产生了很好的匹配的模拟结果,正确占(中微子质量依赖)抑制的质量函数。

英文摘要:

The presence of massive neutrinos affects the growth of large-scale structure in the universe, leaving a potentially observable imprint on the abundance and properties of massive dark matter-dominated halos. Cosmological surveys detect large numbers of these halos in the form of rich groups and clusters, using the information as an input to constraining the properties of dark energy. We use a suite of N-body simulations that include the effects of massive neutrinos as well as of dynamical dark energy to study the properties of the mass function. As in our previous work, we follow an approach valid at low neutrino mass, where the neutrino overdensities are assumed to be too small to act as a significant nonlinear source term for gravity. We study how well a universal form for the halo mass function describes our numerical results, finding that the use of an appropriate linear power spectrum within the formalism yields a good match to the simulation results, correctly accounting for the (neutrino mass-dependent) suppression of the mass function.

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