As emphasized by previous studies, proper treatment of the density fluctuation on the fundamental scale of a cosmological simulation volume - the "DC mode" - is critical for accurate modeling of spatial correlations on scales > 10% of simulation box size. We provide further illustration of the effects of the DC mode on the abundance of halos in small boxes and show that it is straightforward to incorporate this mode in cosmological codes that use the "supercomoving" variables. The equations governing evolution of dark matter and baryons recast with these variables are particularly simple and include the expansion factor, and hence the effect of the DC mode, explicitly only in the Poisson equation.
CMB line-of-sight integrators for nearly-isotropic cosmological models
Universidade Estadual de Londrina(朗德里纳州立大学);Universidade Federal do Rio de Janeiro(里约热内卢联邦大学);Institut d’Astrophysique de Paris, CNRS UMR 7095(巴黎天体物理研究所)
Effects of Mass Varying Neutrinos on Cosmological Parameters as determined from the Cosmic Microwave Background
在具有与中微子耦合的光标量场(“加速子”)的模型中,中微子质量取决于中微子密度。由此产生的质量变化中微子(MaVaN)和加速子的耦合系统可以作为一个负压流体,是暗能量\cite{Fardon:2003eh}的候选者。MaVaN也允许更高的$Σ$ m $_ν$比地球的边界,给后期形成温暖的暗物质。本文研究了中微子质量增加对CMB谱的影响,利用CMBEASY实现了MaVaNs宇宙学。我们发现,CMB频谱只在很低的多极影响。宇宙的变化允许在晚期有显著的温暖暗物质。这意味着在MaVaNs宇宙学中,由CMB确定的$σ_8$可能不是后期结构演化的良好决定因素,可能会减少普朗克合作组织\cite{PlanckSZ:2013}报告的$σ$ $_{8}$之间的张力,而不会增加普朗克确定的哈勃常数值的张力。此外,在MaVaNs理论中,CMB数据并不一定限制地球实验中可能的中微子质量结果。
Towards Implementation of the Pressure-Regulated, Feedback-Modulated Model of Star Formation in Cosmological Simulations: Methods and Application to TNG
The Cosmological Simulation Code OpenGadget3 - Implementation of Self-Interacting Dark Matter
Donostia International Physics Center (DIPC)(圣塞巴斯蒂安国际物理中心);Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians-Universität München(慕尼黑大学天体物理台物理学院);Institute for Theoretical Particle Physics (TTP), Karlsruhe Institute of Technology (KIT)(卡尔斯鲁厄理工学院理论粒子物理研究所);The Oskar Klein Centre, Department of Physics, Stockholm University(斯德哥尔摩大学奥斯克·克莱因中心物理系);Physik Department T31, Technische Universität München(慕尼黑工业大学物理系T31);College of Science and Engineering, University of Minnesota(明尼苏达大学科学与工程学部);Birla Institute of Technology and Science-Pilani, K. K. Birla Goa campus(比拉理工与科学学院皮拉尼校区K.K.比拉果阿分校);INAF - Osservatorio Astronomico di Trieste(意大利国家天体物理研究所的里雅斯特天文台);Max-Planck-Institut für Astrophysik(马克斯·普朗克天体物理学研究所);Hamburger Sternwarte, Universität Hamburg(汉堡大学汉堡天文台);Carnegie Observatories(卡内基观测站)