论文标题
与遗物中微子的结构形成的宇宙学vlasov-poisson模拟：非线性聚类和中微子质量
Cosmological Vlasov-Poisson Simulations of Structure Formation with Relic Neutrinos: Nonlinear Clustering and the Neutrino Mass
论文作者
论文摘要
我们介绍了具有大规模中微子的大规模结构形成的宇宙学模拟结果。首次通过直接整合六维vlasov-Poisson方程，遵循宇宙遗物中微子的相位分布。我们的新方法使我们能够代表中微子的自由流和聚类，以及它们与冷暗物质的重力相互作用。因此，我们获得了独立于常规N体方法的无碰撞动力学的溶液。我们进行了一组混合N体/Vlasov模拟，具有不同的中微子质量，并系统地检查了大规模中微子对大规模结构形成的动力学影响。我们的模拟显示了中微子的特征性大规模聚类及其相对于暗物质的相干流动运动。相对于宇宙平均值，围绕大型星系簇周围的有效局部中微子“温度”变化了几％。簇中的中微子可以变热或更冷，具体取决于中微子的质量。与N体模拟和/或通过扰动理论获得的相比，我们研究了大规模结构和暗物质光环的许多统计数据。我们的模拟标志着数值宇宙学的重要里程碑，并为研究宇宙结构形成的新方法铺平了大量中微子的形成。
We present the results of cosmological simulations of large-scale structure formation with massive neutrinos. The phase-space distribution of the cosmic relic neutrinos is followed, for the first time, by directly integrating the six-dimensional Vlasov-Poisson equations. Our novel approach allows us to represent free streaming and clustering of neutrinos, and their gravitational interaction with cold dark matter accurately. We thus obtain solutions for the collisionless dynamics independent of conventional N-body methods. We perform a suite of hybrid N-body/Vlasov simulations with varying the neutrino mass, and systematically examine the dynamical effects of massive neutrinos on large-scale structure formation. Our simulations show characteristic large-scale clustering of the neutrinos and their coherent streaming motions relative to dark matter. The effective local neutrino "temperature" around massive galaxy clusters varies by several percent with respect to the cosmic mean; the neutrinos in clusters can be hotter or colder depending on the neutrino mass. We study a number of statistics of the large-scale structure and of dark matter halos in comparison with those obtained by N-body simulations and/or by perturbation theory. Our simulations mark an important milestone in numerical cosmology, and pave a new way to study cosmic structure formation with massive neutrinos.
