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arXiv 0907.2898astro-ph.COastro-ph.GA
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宇宙学模拟：标量场的作用

Cosmological simulations: the role of scalar fields

M. A. Rodriguez-Meza

备注：
6 pages, 1 figure
发表信息：
AIP Conf.Proc.1116:171-178,2009
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摘要：

我们提出了$N$体数值模拟研究的大尺度结构的形成。这些研究的主要目的是分析暗物质的几种模型以及它们在大尺度结构形成过程中所起的作用。我们分析了标准的和更成功的案例，即，具有宇宙学常数的冷暗物质（$Λ$ CDM）。我们比较这个模型的结果与其他替代模型的相应结果，特别是，可以从牛顿极限的替代引力理论，如标量张量理论的模型。一个特定的模型是认为标量场与爱因斯坦-希尔伯特拉格朗日量中的里奇标量非最小耦合，在牛顿极限下，给出了由两个贡献给出的有效引力：标准牛顿势加上来自大质量标量场的汤川势。通过分析z=0时的$N$ -车身系统的快照，对SF参数的几个值进行了模型比较。

英文摘要：

We present numerical $N$-body simulation studies of large-scale structure formation. The main purpose of these studies is to analyze the several models of dark matter and the role they played in the process of large-scale structure formation. We analyze the standard and more successful case, i.e., the cold dark matter with cosmological constant ($Λ$CDM). We compare the results of this model with the corresponding results of other alternative models, in particular, the models that can be built from the Newtonian limit of alternative theories of gravity like scalar-tensor theories. An specific model is the one that considers that the scalar field is non-minimally coupled to the Ricci scalar in the Einstein-Hilbert Lagrangian that gives, in the Newtonian limit an effective gravitational force that is given by two contributions: the standard Newtonian potential plus a Yukawa potential that comes from a massive scalar field. Comparisons of the models are done by analyzing the snapshots of the $N$-body system at z=0 for several values of the SF parameters.

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