arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0807.1020astro-phgr-qchep-phhep-th
收藏

统一暗物质模型的标量场如何成团

How the Scalar Field of Unified Dark Matter Models Can Cluster

Daniele Bertacca, Nicola Bartolo, Antonaldo Diaferio, Sabino Matarrese

摘要:

我们使用标量场拉格朗日函数与非正则动力学项,以获得统一的暗物质模型的暗物质和暗能量,后者模仿一个宇宙学常数,描述的标量场本身。在这个框架中,我们提出了一种技术来重建模型的有效声速是足够小的标量场可以集群。这些模型避免了强烈的时间演化的引力势和大的综合萨克斯-沃尔夫效应,这是一个严重的缺点,以前考虑的模型。此外,这些统一的暗物质标量场模型可以很容易地推广为暗物质加上暗能量成分,表现得像任何类型的精华流体。

英文摘要:

We use scalar-field Lagrangians with a non-canonical kinetic term to obtain unified dark matter models where both the dark matter and the dark energy, the latter mimicking a cosmological constant, are described by the scalar field itself. In this framework, we propose a technique to reconstruct models where the effective speed of sound is small enough that the scalar field can cluster. These models avoid the strong time evolution of the gravitational potential and the large Integrated Sachs-Wolfe effect which have been a serious drawback of previously considered models. Moreover, these unified dark matter scalar field models can be easily generalized to behave as dark matter plus a dark energy component behaving like any type of quintessence fluid.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑