Simulations of the universe using modified newtonian dynamics

使用修正牛顿动力学模拟宇宙

• 批准号: 24942194
• 负责人: Privatdozent Dr. Volker Müller, since 3/2009
• 金额: --
• 依托单位: Leibniz-Institut für Astrophysik Potsdam (AIP)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/24942194?language=en
• 关键词: Simulations; universe; using; modified; newtonian

Despite the remarkable success of the concordance cosmological model (¿CDM, ¿-Cold-Dark- Matter) including about 28% dark matter, 4% baryonic matter and 68% dark energy there appear to be quite distinct deviations between predictions of this standard model and observations. The problems frequently summarized as cold dark matter (CDM) crisis still persist: the debate about the exact value of the logarithmic inner slope of the density profiles of (galactic) halos continues and the discrepancy about the abundance of satellite galaxies has not been resolved, too. While the general belief amongst the astronomical community is to modify and fine-tune the parameters of the dark mater model in order to move towards an agreement, little effort is spent investigating alternative solutions to this CDM crisis. In this application another possibility is put forward which is based upon a simple yet ground shaking adjustment to Newton s second law of motion, namely Modified Newtonian Dynamics or MOND. The recent progress in the development of MOND and the embedding of it into a general relativistic framework made this theory a highly promising alternative the dark matter. First steps of applying MOND to cosmological N-body-simulations of the structure formation in the Universe indicated rather reassuring results speaking in favour of this radical approach. However, to gain full insight into this unusual theory and to better understand its predictive power it appears unavoidable to revisit the subject taking into account the latest improvements in its formulation.

尽管包含约 28% 暗物质、4% 重子物质和 68% 暗能量的一致性宇宙学模型（¿CDM，Н-冷暗物质）取得了显着成功，但该标准模型的预测与观测之间似乎存在相当明显的偏差。经常被概括为冷暗物质（CDM）危机的问题仍然存在：关于（星系）晕密度剖面的对数内斜率的确切值的争论仍在继续，并且关于卫星星系丰度的差异也尚未解决。虽然天文学界的普遍信念是修改和微调暗物质模型的参数以达成协议，但很少有人花精力研究这场清洁发展机制危机的替代解决方案。在此应用中，提出了另一种可能性，该可能性基于对牛顿第二运动定律的简单但重大的调整，即修正牛顿动力学或 MOND。 MOND 发展的最新进展以及将其嵌入到广义相对论框架中，使该理论成为暗物质的非常有前途的替代理论。将 MOND 应用到宇宙结构形成的宇宙学 N 体模拟的第一步表明了相当令人放心的结果，支持这种激进的方法。然而，为了充分了解这一不寻常的理论并更好地理解其预测能力，似乎不可避免地要重新审视该主题，并考虑其表述中的最新改进。